# Best Email Deliverability Solutions - Page 9 *By [Yukta Rustagi](https://research.g2.com/insights/author/yukta-rustagi)* Email deliverability tools help businesses monitor and optimize email campaigns to improve their inbox placement and reputation among recipients. These tools are advantageous within marketing and sales strategies, increasing open rates and conversion opportunities by ensuring emails bypass spam folders and are strategically composed to be perceived as legitimate. Email deliverability tools are used primarily by email marketers or organizational teams involved with sending bulk emails to contact lists and leads. Successful use of these tools can put valuable content or sales opportunities in front of more subscribers and help prevent emails from getting lost in the shuffle or tagged as spam. Email deliverability software often integrates with [email marketing software](https://www.g2.com/categories/email-marketing), and a number of products in the Email Marketing category include features related to email delivery and inbox placement. These tools may similarly function in tandem with [marketing automation software](https://www.g2.com/categories/marketing-automation). Email deliverability software may offer features related to DMARC software to help ensure emails and email accounts are authenticated to avoid imposter activity that could cause flagging and poor inbox placement. Email deliverability platforms may also integrate with or offer features of [email tracking software](https://www.g2.com/categories/email-tracking) to monitor email performance, such as open rates, processing time, and email delivery latency. To qualify for inclusion in the Email Deliverability category, a product must: - Provide tools for testing and optimizing emails against up-to-date spam filter analyses - Analyze sender accounts for potential flagging or placement issues - Provide timely metrics related to email delivery and sender reputation ## Top Email Deliverability Tools at a Glance | # | Product | Rating | Best For | What Users Say | |---|---------|--------|----------|----------------| | 1 | [Constant Contact](https://www.g2.com/products/constant-contact/reviews) | 4.1/5.0 (7,215 reviews) | Inbox-landing bulk email with built-in compliance | "[Clean, Affordable Newsletter Tool with Easy Integrations, Analytics, and A/B Testing](https://www.g2.com/survey_responses/constant-contact-review-12722795)" | | 2 | [Instantly](https://www.g2.com/products/instantly/reviews) | 4.8/5.0 (4,118 reviews) | Cold outreach deliverability with automated inbox warm-up | "[Perfect Balance: Easy Beginner-Friendly Setup, and Warmup That Allows Campaigns To Go Live Fast](https://www.g2.com/survey_responses/instantly-review-12964227)" | | 3 | [Apollo.io](https://www.g2.com/products/apollo-io/reviews) | 4.7/5.0 (9,345 reviews) | Outbound sequencing with verified-contact deliverability | "[Best value B2B prospecting tool on the market today](https://www.g2.com/survey_responses/apollo-io-review-12700971)" | | 4 | [Warmy](https://www.g2.com/products/warmy/reviews) | 4.8/5.0 (521 reviews) | Automated sender-reputation warm-up and inbox placement | "[A reliable business solution that actually delivers results](https://www.g2.com/survey_responses/warmy-review-12929195)" | | 5 | [Brevo Marketing Platform](https://www.g2.com/products/brevo-marketing-platform/reviews) | 4.5/5.0 (2,444 reviews) | Inbox-reaching bulk email with multi-channel automation | "[All-in-One Marketing Platform That Simplifies Automation, Improves Targeting, and Drives Better ROI](https://www.g2.com/survey_responses/brevo-marketing-platform-review-12763163)" | | 6 | [Klaviyo](https://www.g2.com/products/klaviyo/reviews) | 4.6/5.0 (1,309 reviews) | Behavior-based email deliverability with Shopify segmentation | "[Klaviyo Makes Email Automation Simple, Powerful, and Reliable](https://www.g2.com/survey_responses/klaviyo-review-12738916)" | | 7 | [lemlist](https://www.g2.com/products/lemlist/reviews) | 4.6/5.0 (1,707 reviews) | Multichannel cold outreach with built-in warmup | "[A core part of our startup's growth stack](https://www.g2.com/survey_responses/lemlist-review-13062775)" | | 8 | [Dotdigital](https://www.g2.com/products/dotdigital/reviews) | 4.4/5.0 (1,189 reviews) | Omnichannel campaign delivery with inbox-first segmentation | "[DotDigital’s real-time analytics and dynamic content make campaigns smarter](https://www.g2.com/survey_responses/dotdigital-review-12969976)" | | 9 | [Intuit Mailchimp Email Marketing](https://www.g2.com/products/intuit-mailchimp-email-marketing/reviews) | 4.3/5.0 (12,668 reviews) | Bulk email deliverability with drag-and-drop campaigns | "[Beginner-Friendly Email Marketing with Powerful Automation and Analytics](https://www.g2.com/survey_responses/intuit-mailchimp-email-marketing-review-12830177)" | | 10 | [ZeroBounce](https://www.g2.com/products/zerobounce/reviews) | 4.7/5.0 (1,354 reviews) | Bulk email list validation and sender reputation defense | "[Accurate Email Verification That Boosts Deliverability and List Hygiene](https://www.g2.com/survey_responses/zerobounce-review-12781582)" | --- ## What Are the Most Common Questions About Email Deliverability Tools? *AI-generated · Last updated: May 26, 2026* ### Which platform offers real-time email deliverability monitoring? Based on G2 reviews, [Warmy](https://www.g2.com/products/warmy/reviews/warmy-review-12838402) is the strongest fit for real-time email deliverability monitoring in this dataset. According to verified users, Warmy gives clear visibility into inbox placement across providers, ongoing email performance updates, and alerts that help teams spot issues early. G2 reviewers mention using it to monitor domain reputation, track mailbox health, and understand how outreach is performing across environments like Gmail and Microsoft 365. Reviews also highlight that the platform makes it easier to react before deliverability problems become larger campaign risks, which is especially valuable for teams running regular outbound or high-volume communication programs. ### Which email deliverability solution offers AI-based optimization? Based on G2 reviews, several products mention AI-assisted deliverability workflows, but Warmy appears most directly aligned with AI-based optimization. According to verified users, Warmy’s Adeline AI helps automate warm-up activity, maintain sender reputation, and support inbox placement without requiring constant manual intervention. G2 reviewers mention using it to stabilize domain health, manage outreach more predictably, and reduce guesswork when improving deliverability. Other products in the dataset also reference AI features, but Warmy reviews most consistently connect AI to practical deliverability outcomes like warm-up automation, monitoring, and reputation protection. That makes it a strong option for teams prioritizing AI-supported email deliverability workflows. ### What is the best tools for identifying and resolving spam filter issues? Based on G2 reviews, buyers looking to identify and resolve spam filter issues tend to focus on products that combine monitoring, inbox placement visibility, and domain health guidance. According to verified users, these tools help teams understand why emails are landing in spam, spot authentication or reputation problems, and adjust sending practices before campaigns are affected. G2 reviewers mention using them to monitor inbox placement, diagnose provider-specific issues, improve sender reputation, and protect domains during outreach or high-volume sending. Reviews also show that support quality matters here, since teams often need help interpreting deliverability signals and turning them into actions that improve inbox placement and reduce spam-folder placement. **Here are some of the top-rated products on G2:** - [Warmy](https://www.g2.com/products/warmy/reviews/warmy-review-12838402) – used to monitor inbox placement, domain reputation, and provider-specific deliverability issues - [Inbox Monster](https://www.g2.com/products/inbox-monster/reviews/inbox-monster-review-12489136) – helps teams validate inbox placement and diagnose sender reputation problems before campaigns are impacted - [Unspam.email](https://www.g2.com/products/unspam-email/reviews/unspam-email-review-11946760) – used to check inbox placement, spam triggers, and rendering issues before launch ### Which is the best email deliverability platform for marketers? Based on G2 reviews, the best email deliverability platform for marketers depends on whether the priority is monitoring, warm-up, list hygiene, or campaign execution. According to verified users, marketers value platforms that improve inbox placement, simplify deliverability checks, and make it easier to understand sender reputation without needing deep technical expertise. G2 reviewers mention using these tools to monitor inbox placement, clean contact lists, warm domains, and support stronger campaign performance. Reviews also highlight the importance of clear dashboards, actionable reporting, and responsive support, since marketers often need to move quickly when deliverability issues affect engagement. In this category, no single platform covers every use case equally well for every team. ### Which tool is best for email list hygiene and verification? Based on G2 reviews, ZeroBounce stands out as a strong option for email list hygiene and verification. According to verified users, it helps teams validate addresses, reduce bounce rates, identify invalid or risky emails, and protect sender reputation before campaigns are launched. G2 reviewers mention using it to clean large contact lists, support CRM hygiene, and improve overall deliverability by filtering out bad data. Reviews also highlight added checks such as spam trap detection, activity insights, and smooth integrations for ongoing validation workflows. For teams focused on keeping outreach lists clean and reducing wasted sends, ZeroBounce is one of the most consistently praised tools in the recent review set. **Here are some of the top-rated products on G2:** - [ZeroBounce](https://www.g2.com/products/zerobounce/reviews/zerobounce-review-12781582) – used to verify invalid, risky, and disposable emails before campaigns go out - [Reoon Email Verifier](https://www.g2.com/products/reoon-email-verifier/reviews/reoon-email-verifier-review-12255190) – helps teams verify bulk lists quickly and reduce bounced emails in outreach - [Bouncer](https://www.g2.com/products/bouncer/reviews/bouncer-review-12313611) – supports list cleaning and bounce-rate reduction before cold email or campaign sends ### What is the best email deliverability software for bulk campaigns? Based on G2 reviews, the strongest software for bulk campaigns combines reliable sending, sender reputation support, and tools that keep high-volume outreach out of spam. According to verified users, bulk senders care most about consistent inbox placement, warm-up automation, and visibility into performance when sending at scale. G2 reviewers mention using these platforms for large outbound programs, high-volume newsletters, and transactional or promotional sends where domain health is critical. Reviews also show that bulk campaign teams value easy setup, support for multiple inboxes or domains, and clear reporting on deliverability. The best fit depends on whether the goal is outbound scale, warm-up, or broader campaign management rather than a single universal winner. **Here are some of the top-rated products on G2:** - [Instantly](https://www.g2.com/products/instantly/reviews/instantly-review-12794698) – used for high-volume cold outreach with warm-up, multi-mailbox management, and reply handling - [Smartlead](https://www.g2.com/products/smartlead/reviews/smartlead-review-12750562) – helps teams scale outbound campaigns with warm-up, inbox rotation, and centralized campaign management - [Constant Contact](https://www.g2.com/products/constant-contact/reviews/constant-contact-review-12707465) – supports reliable large-audience email communication with deliverability and list management for non-specialist teams ### What is top tools for tracking sender reputation? Based on G2 reviews, top tools for tracking sender reputation are the ones that give clear visibility into mailbox health, domain reputation, and inbox placement over time. According to verified users, these products help teams monitor sending health before issues affect campaign performance. G2 reviewers mention using them to watch provider-specific placement, identify reputation drops, and troubleshoot domain or mailbox problems across Gmail, Microsoft 365, and other environments. Reviews also show that teams value tools with alerts, trend reporting, and easy-to-read dashboards so both technical and non-technical users can respond quickly. Sender reputation tracking is often most effective when paired with warm-up, authentication monitoring, and deliverability testing in the same workflow. **Here are some of the top-rated products on G2:** - [Warmy](https://www.g2.com/products/warmy/reviews/warmy-review-12838402) – used to monitor domain reputation, inbox placement, and email performance across major providers - [Inbox Monster](https://www.g2.com/products/inbox-monster/reviews/inbox-monster-review-12152555) – helps teams track sender reputation, inbox placement, and ISP-level deliverability trends - [Suped](https://www.g2.com/products/suped/reviews/suped-review-12810436) – provides blocklist monitoring and reputation tracking history for domain health visibility ### What is top tools for improving email inbox placement rates? Based on G2 reviews, tools for improving inbox placement rates usually focus on warming domains, monitoring reputation, and testing where emails land before campaigns go live. According to verified users, these products help reduce spam placement, improve sender trust, and make inbox placement more predictable across major providers. G2 reviewers mention using them to monitor inbox placement, warm new or damaged domains, manage spam-folder issues, and improve engagement by keeping messages visible. Reviews also highlight that strong support and actionable reporting make a difference, because teams need to know what to fix when deliverability starts slipping. The best results often come from combining monitoring with authentication and sender reputation management. **Here are some of the top-rated products on G2:** - [Warmy](https://www.g2.com/products/warmy/reviews/warmy-review-12814648) – used to improve inbox placement and create a more predictable outbound process - [Mailwarm](https://www.g2.com/products/mailwarm/reviews/mailwarm-review-12397166) – helps warm email accounts and improve inbox placement before cold outreach - [InboxAlly](https://www.g2.com/products/inboxally/reviews/inboxally-review-11622076) – supports inbox placement by building sender reputation through engagement-focused warm-up activity ### What is top-rated email deliverability platforms for transactional emails? Based on G2 reviews, transactional email buyers prioritize reliability, strong delivery tracking, and simple integration. According to verified users, the best-rated transactional options help teams send confirmations, alerts, resets, and system notifications without worrying about delays or poor inbox placement. G2 reviewers mention using these platforms for application notifications, customer confirmations, internal alerts, and other time-sensitive transactional communication. Reviews also highlight the value of clear logs, dependable APIs or SMTP options, and high confidence that important emails reach recipients. For this use case, platforms that combine strong infrastructure with easy implementation tend to stand out more than broad marketing tools, especially for product, engineering, and operations teams. **Here are some of the top-rated products on G2:** - [Mailtrap](https://www.g2.com/products/mailtrap/reviews/mailtrap-review-11394844) – used for transactional email delivery with clear API setup and reliable inboxing - [Twilio SendGrid Email API](https://www.g2.com/products/twilio-sendgrid-email-api/reviews/twilio-sendgrid-email-api-review-1187657) – supports dependable contact forms, alerts, and transactional notifications - [Netcore Email API](https://www.g2.com/products/netcore-email-api/reviews/netcore-email-api-review-12160677) – handles transactional and bulk email with tracking and dependable delivery performance ### What is the best platforms for integrating deliverability with email marketing? Based on G2 reviews, the best platforms for integrating deliverability with email marketing are the ones that combine campaign execution with sender health, monitoring, or deliverability controls in the same workflow. According to verified users, marketers benefit when segmentation, automation, and sending performance live in one platform instead of across disconnected tools. G2 reviewers mention using these products to run email campaigns, track inbox placement, improve list quality, and support stronger delivery without adding heavy technical overhead. Reviews also point to the value of integrated reporting, warm-up or reputation safeguards, and support for both marketing and transactional communication. The strongest options vary depending on whether the priority is simplicity, scale, or deeper outbound control. **Here are some of the top-rated products on G2:** - [Brevo Marketing Platform](https://www.g2.com/products/brevo-marketing-platform/reviews/brevo-marketing-platform-review-12763163) – combines email campaigns, segmentation, and multichannel communication in one dashboard - [Intuit Mailchimp Email Marketing](https://www.g2.com/products/mailchimp-email-marketing/reviews/mailchimp-email-marketing-review-12805185) – supports email workflows and improved deliverability with integrated campaign tools - [ActiveCampaign](https://www.g2.com/products/activecampaign/reviews/activecampaign-review-12101426) – brings automation, contact management, and deliverability-focused email execution into one platform ## How Many Email Deliverability Tools Products Does G2 Track? **Total Products under this Category:** 216 ### Category Stats (Jul 2026) - **Average Rating**: 4.52/5 The average rating of products in this category, based on all submitted ratings - **Top Trending Product**: Sparkle.io (+5.77%) - Among all products in this category, Sparkle.io recorded the largest rating increase compared to last month *Last updated: July 06, 2026* ## How Does G2 Rank Email Deliverability Tools Products? **Why You Can Trust G2's Software Rankings:** - 30 Analysts and Data Experts - 71,100+ Authentic Reviews - 216+ Products - Unbiased Rankings G2's software rankings are built on verified user reviews, rigorous moderation, and a consistent research methodology maintained by a team of analysts and data experts. Each product is measured using the same transparent criteria, with no paid placement or vendor influence. While reviews reflect real user experiences, which can be subjective, they offer valuable insight into how software performs in the hands of professionals. Together, these inputs power the G2 Score, a standardized way to compare tools within every category. ## Which Email Deliverability Tools Is Best for Your Use Case? - **Leader:** [Constant Contact](https://www.g2.com/products/constant-contact/reviews) - **Highest Performer:** [Reoon Email Verifier](https://www.g2.com/products/reoon-email-verifier/reviews) - **Easiest to Use:** [Bouncer](https://www.g2.com/products/bouncer/reviews) - **Top Trending:** [Instantly](https://www.g2.com/products/instantly/reviews) - **Best Free Software:** [Intuit Mailchimp Email Marketing](https://www.g2.com/products/intuit-mailchimp-email-marketing/reviews) --- **Sponsored** ### InboxAlly InboxAlly is an award-winning email deliverability platform that helps businesses ensure their emails land in the inbox instead of the spam folder. It is trusted by marketers, sales teams, agencies, and enterprises to protect sender reputation, improve campaign performance, and maximize the ROI of email. The platform serves organizations of all sizes, from startups to high-volume enterprises, that rely on email as a key communication and revenue channel. With InboxAlly, users gain visibility into exactly where their emails are delivered across Gmail, Outlook, Yahoo, and corporate filters, along with actionable insights to strengthen inbox placement and drive more engagement. InboxAlly provides a complete suite of deliverability tools, including automated warmup, inbox placement testing, authentication and blacklist monitoring, and advanced analytics for opens, clicks, replies, and bounces. These features allow businesses to continually refine their email strategies and maintain a strong reputation with mailbox providers. In addition to everyday optimization, the platform is also widely used for reputation repair—helping senders rebuild trust with providers after setbacks—and for scaling campaigns safely, ensuring new domains and IPs can be introduced smoothly without disrupting ongoing deliverability. Ease of use is a core principle of InboxAlly. The platform is designed to be accessible to users at every level, requiring no technical expertise, and it integrates easily into existing workflows. Whether a small business running its first campaigns or an enterprise managing millions of daily emails, InboxAlly adapts to the scale and complexity of the sender’s needs. Flexible pricing starts at $149 per month, with higher tiers available for larger or enterprise-level requirements. InboxAlly stands out in the deliverability category by combining powerful technology, actionable data, and world-class support. It not only helps businesses consistently reach the inbox, but also enables them to build stronger reputations, scale sending with confidence, and achieve more meaningful results from every campaign. [Visit website](https://www.g2.com/external_clickthroughs/record?secure%5Bad_program%5D=paid_promo&secure%5Bad_slot%5D=category_product_list&secure%5Bcategory_id%5D=1392&secure%5Bchosen_at%5D=2026-07-06T08%3A29%3A31Z&secure%5Bmedium%5D=sponsored&secure%5Bprioritized%5D=false&secure%5Bproduct_id%5D=160455&secure%5Bresource_id%5D=1392&secure%5Bresource_type%5D=Category&secure%5Bsource_type%5D=category_page&secure%5Bsource_url%5D=https%3A%2F%2Fwww.g2.com%2Fcategories%2Femail-deliverability%3Fpage%3D6&secure%5Btoken%5D=970bbfa37c5f1877c8203e497ba687defe934885263ba25e2b00d004b0b2fbfb&secure%5Burl%5D=https%3A%2F%2Fwww.inboxally.com%2Fpricing&secure%5Burl_type%5D=paid_promos) --- ## What Are the Top-Rated Email Deliverability Tools Products in 2026? ### 1. [SendCatalyst](https://www.g2.com/products/sendcatalyst/reviews) SendCatalyst provides 99.9% deliverability with automated setup, dedicated IPs, and lightning-fast onboarding. No tech headaches, just results. Perfect for cold email pros who want to scale fast and stay out of spam. **Who Is the Company Behind SendCatalyst?** - **Seller:** [SendCatalyst](https://www.g2.com/sellers/sendcatalyst) - **HQ Location:** N/A - **LinkedIn® Page:** https://www.linkedin.com/company/sendcatalyst/ (1 employees on LinkedIn®) ### 2. [SendFlow AI](https://www.g2.com/products/sendflow-ai/reviews) SendFlow AI is the AI-powered email marketing platform that guarantees your emails land in the primary inbox. Our proprietary Primary Inbox Score analyzes every email before sending and predicts exactly where it will land — inbox or spam. Key Features: - Primary Inbox Score: AI-powered deliverability prediction before you hit send - Smart Automation: Behavioral triggers, drip campaigns, and dynamic segmentation - Predictive Analytics: AI forecasts open rates, click rates, and optimal send times - GDPR Compliant: Full compliance with European privacy regulations - Multi-language: Native support for Italian and Spanish markets Built specifically for SMBs in Italy and Spain. Plans start at €29/month with a 14-day free trial. **Who Is the Company Behind SendFlow AI?** - **Seller:** [SendFlow AI](https://www.g2.com/sellers/sendflow-ai) - **HQ Location:** N/A - **LinkedIn® Page:** https://www.linkedin.com/company/sendflow-ai/ (1 employees on LinkedIn®) ### 3. [SendMatico](https://www.g2.com/products/sendmatico/reviews) SendMatico is a B2B SaaS platform built for cold email outreach, sales automation, and agency outbound workflows. The platform helps agencies, startups, and sales teams manage outreach campaigns, connect multiple sending accounts, rotate mailboxes for deliverability, automate follow-ups, detect replies, track meetings, and manage credit-basedsending from one place. Unlike traditional monthly subscription tools, SendMatico uses a credit-based pricing model, allowing users to start with free credits and buy additional credit packs when they need them. This makes it useful for agencies managing changing client volume, startups testing outbound campaigns, and teams that want flexible outreach infrastructure without fixed recurring software costs. **Who Is the Company Behind SendMatico?** - **Seller:** [SendMatico](https://www.g2.com/sellers/sendmatico) - **Year Founded:** 2024 - **HQ Location:** N/A - **LinkedIn® Page:** https://www.linkedin.com/company/sendmatico (1 employees on LinkedIn®) ### 4. [SendReach](https://www.g2.com/products/sendreach/reviews) SendReach was built by email marketers to help with their needs to market their products and services. **Who Is the Company Behind SendReach?** - **Seller:** [SendReach](https://www.g2.com/sellers/sendreach) - **HQ Location:** N/A - **LinkedIn® Page:** https://www.linkedin.com/company/No-Linkedin-Presence-Added-Intentionally-By-DataOps (1 employees on LinkedIn®) ### 5. [SendWP](https://www.g2.com/products/sendwp/reviews) SendWP is a new email service for WordPress that delivers ALL emails generated by your WordPress site. For only $9 a month per site, you can ensure that you never miss a form submission, purchase receipt, or user notification. With support for attachments and no limit on the number of emails that your site can send, SendWP is a great solution for anyone that needs to make sure their WordPress emails are delivered properly. **Who Is the Company Behind SendWP?** - **Seller:** [Saturday Drive](https://www.g2.com/sellers/saturday-drive) - **HQ Location:** N/A - **LinkedIn® Page:** https://www.linkedin.com/company/No-Linkedin-Presence-Added-Intentionally-By-DataOps (1 employees on LinkedIn®) ### 6. [SMTPBOXES.COM](https://www.g2.com/products/smtpboxes-com/reviews) SMTPBOXES welcomes every non-spammer no matter the purpose of your email ! Mainly designed for mass email campaigns, although usable for transactional emails as well. SMTPBOXES is cheap and reliable You'll rent smtpbox (server) specially designed for email services. Doesn't get any better than that because it is something that you'll have for yourself. The system works that the more fair user you're the more IPs are involved for your email campaigns which brings really high INBOX rates. Pricing is more than competitive. The cheapest plan is $18.99/month while the most expensive is $316.99/month - choice for small and big marketers. Each plan gives you unlimited relays and the difference come from the fact that the smtpbox you choose can have different characteristics. In total 6 different setups to choose from (3 with AMD processors & 3 with Intel processors). SMTP secure and Online platform Our service is 2in1 If you need SMTP connection only and you have something in mind like using your own SMTP client or another more advanced platform (such as sendy) you can place your SMTP details there and start sending! Works flawlessly. OR for no cost, you can use the integrated smtpboxes simple online platform that does the most important things an email marketer needs. Trial option available You can try the service for as little as 0.99 EUR and send more than 2k emails in the time frame of 1 week. SMTPBOXES support can set your DKIM and SPF settings to your domain if you don't know how. These records are important and required for your high delivery rate. **Who Is the Company Behind SMTPBOXES.COM?** - **Seller:** [SMTPBOXES](https://www.g2.com/sellers/smtpboxes) - **HQ Location:** N/A - **LinkedIn® Page:** https://www.linkedin.com/company/No-Linkedin-Presence-Added-Intentionally-By-DataOps (1 employees on LinkedIn®) ### 7. [SMTPGrid](https://www.g2.com/products/smtpgrid/reviews) SMTPGrid is designed for SaaS companies, email service providers, agencies, marketing teams, and enterprises that send high volumes of transactional or marketing emails and need greater deliverability, provider redundancy, and operational flexibility. The platform intelligently routes email traffic based on recipient ISP, provider performance, and custom routing rules, helping improve inbox placement and sender reputation. Built-in features such as automatic failover, mailbox warm-up, dedicated IP management, IP whitelisting, suppression management, bounce handling, webhook tracking, and real-time analytics enable businesses to operate resilient and scalable email infrastructure without complex integrations **Who Is the Company Behind SMTPGrid?** - **Seller:** [Info Science Labs](https://www.g2.com/sellers/info-science-labs-cd7b543e-ef9b-4cb1-b097-07ed11c527b4) - **Year Founded:** 2016 - **HQ Location:** Dover, US - **LinkedIn® Page:** https://www.linkedin.com/company/30182720 (48 employees on LinkedIn®) ### 8. [SMTPServer](https://www.g2.com/products/smtpserver/reviews) SMTPSERVER.com is the cost-efficient SMTP server provider for all your email marketing needs that ensures optimal email deliverability by reaching email directly into your customer’s inbox. Simply choose how many IP addresses are necessary for you, proceed to check out and we’ll take care of the rest! **Who Is the Company Behind SMTPServer?** - **Seller:** [SMTPServer](https://www.g2.com/sellers/smtpserver) - **Year Founded:** 2021 - **HQ Location:** Riga, LV - **LinkedIn® Page:** https://www.linkedin.com/company/smtpserver/ (4 employees on LinkedIn®) ### 9. [TagMyMail](https://www.g2.com/products/tagmymail/reviews) TagMyMail allows you to use your Gmail account to send out trackable emails. No installation needed and works across both Web and Mobile devices. **Who Is the Company Behind TagMyMail?** - **Seller:** [TagMyMail](https://www.g2.com/sellers/tagmymail) - **HQ Location:** N/A - **LinkedIn® Page:** https://www.linkedin.com/company/No-Linkedin-Presence-Added-Intentionally-By-DataOps (1 employees on LinkedIn®) ### 10. [Unlistr](https://www.g2.com/products/unlistr/reviews) Unlistr helps the users to manage and unsubscribe unwanted email automatically. **Who Is the Company Behind Unlistr?** - **Seller:** [Unlistr](https://www.g2.com/sellers/unlistr) - **HQ Location:** N/A - **LinkedIn® Page:** https://www.linkedin.com/company/No-Linkedin-Presence-Added-Intentionally-By-DataOps (1 employees on LinkedIn®) ### 11. [Warmbox](https://www.g2.com/products/warmbox/reviews) Warm-up your cold email inbox. And never land in spam anymore. Try Warmbox.ai now and start to warm-up your inbox for cold emailing. **Who Is the Company Behind Warmbox?** - **Seller:** [Warmbox](https://www.g2.com/sellers/warmbox) - **Year Founded:** 2020 - **HQ Location:** N/A - **LinkedIn® Page:** https://www.linkedin.com/company/warmbox/ (6 employees on LinkedIn®) ### 12. [WarmInbox](https://www.g2.com/products/warminbox/reviews) WarmInbox is a fully automated email warmup tool that helps individuals and teams improve deliverability and avoid spam folders. By simulating natural email activity like opens, replies, and clicks, WarmInbox builds sender reputation gradually and safely. It supports multiple inboxes, team invitations, secure app password setup, and real-time performance tracking—making it ideal for anyone sending cold emails, newsletters, or outbound campaigns. **Who Is the Company Behind WarmInbox?** - **Seller:** [WarmInbox](https://www.g2.com/sellers/warminbox) - **HQ Location:** N/A - **LinkedIn® Page:** https://www.linkedin.com/company/No-Linkedin-Presence-Added-Intentionally-By-DataOps (1 employees on LinkedIn®) ### 13. [WarmupIP](https://www.g2.com/products/warmupip/reviews) WarmupIP is an email deliverability platform designed to help businesses improve inbox placement, strengthen sender reputation, and scale email outreach with confidence. Built for SaaS companies, agencies, lead generation teams, and high-volume senders, WarmupIP combines automated warmup, deliverability monitoring, reputation management, and infrastructure optimization in one platform. Our solutions help organizations improve email performance, reduce spam placement, and maintain healthy sending practices across Gmail and Microsoft ecosystems. Backed by experienced deliverability specialists, WarmupIP provides the tools and expertise needed to build a reliable foundation for long-term email success **Who Is the Company Behind WarmupIP?** - **Seller:** [WarmupIP](https://www.g2.com/sellers/warmupip) - **Year Founded:** 2022 - **HQ Location:** Florida, US - **Twitter:** @WarmupIP (3 Twitter followers) - **LinkedIn® Page:** https://www.linkedin.com/company/warmupip/ (6 employees on LinkedIn®) ### 14. [WhatCounts](https://www.g2.com/products/whatcounts/reviews) WhatCounts is an email service provider helping you send what counts with an amazing platform and full-service agency to back it up. We partner with companies to drive more revenue by leveraging our savvy email experts and a sophisticated email marketing platform. We provide data management, software, and services to marketers seeking to deliver smart personalized digital messages to their target audiences. The WhatCounts team works hard to make sure your subscribers always receive meaningful messages. **Average Rating:** 3.4/5.0 **Total Reviews:** 14 **How Do G2 Users Rate WhatCounts?** - **Has the product been a good partner in doing business?:** 8.3/10 (Category avg: 9.0/10) **Who Is the Company Behind WhatCounts?** - **Seller:** [Zeta Global](https://www.g2.com/sellers/zeta-global) - **Year Founded:** 2007 - **HQ Location:** New York, NY - **Twitter:** @ZetaGlobal (16,660 Twitter followers) - **LinkedIn® Page:** https://www.linkedin.com/company/zetaglobal/posts/?feedView=all (2,991 employees on LinkedIn®) - **Ownership:** NYSE: ZETA **Who Uses This Product?** - **Company Size:** 71% Mid-Market, 21% Enterprise #### What Are Recent G2 Reviews of WhatCounts? **"[Email Marketing Software](https://www.g2.com/survey_responses/whatcounts-review-656631)"** **Rating:** 4.0/5.0 stars *— Verified User in Computer Software* [Read full review](https://www.g2.com/survey_responses/whatcounts-review-656631) --- **"[Great tool for email marketing beginner](https://www.g2.com/survey_responses/whatcounts-review-505913)"** **Rating:** 4.0/5.0 stars *— Verified User in Internet* [Read full review](https://www.g2.com/survey_responses/whatcounts-review-505913) --- #### What Are G2 Users Discussing About WhatCounts? - [What is WhatCounts used for?](https://www.g2.com/discussions/what-is-whatcounts-used-for) ### 15. [XemailAudit](https://www.g2.com/products/xemailaudit/reviews) XemailAudit provides real-time solutions for email deliverability issues, ensuring that users can resolve problems as they arise. With a user-friendly interface and comprehensive email analysis, XemailAudit offers a seamless experience for all users. **Who Is the Company Behind XemailAudit?** - **Seller:** [XGrowth](https://www.g2.com/sellers/xgrowth-9596fe3b-a67d-41fa-956e-a362cf41d28e) - **Year Founded:** 2021 - **HQ Location:** Wilmington, US - **LinkedIn® Page:** https://www.linkedin.com/company/xgrowth-llc/ (13 employees on LinkedIn®) ### 16. [Xenon Mail](https://www.g2.com/products/xenon-mail/reviews) Xenon Mail is an automated retargeting system, providing companies with the ability to remind email recipients of campaigns. **Who Is the Company Behind Xenon Mail?** - **Seller:** [Media Prowler](https://www.g2.com/sellers/media-prowler) - **Year Founded:** 2007 - **HQ Location:** Reston, US - **LinkedIn® Page:** https://www.linkedin.com/company/media-prowler (15 employees on LinkedIn®) **Who Uses This Product?** - **Company Size:** 100% Enterprise, 100% Small-Business ## What Is Email Deliverability Tools? [Marketing Software](https://www.g2.com/categories/marketing) ## What Software Categories Are Similar to Email Deliverability Tools? - [Email Marketing Software](https://www.g2.com/categories/email-marketing) - [Transactional Email Software](https://www.g2.com/categories/transactional-email) - [Email Tracking Software](https://www.g2.com/categories/email-tracking) - [Email Verification Software](https://www.g2.com/categories/email-verification) - [Email Template Builder Software](https://www.g2.com/categories/email-template-builder) - [SMS Marketing Software](https://www.g2.com/categories/sms-marketing) - [Email Testing Software](https://www.g2.com/categories/email-testing)