Total Products under this Category: 249
Last updated: September 01, 2026
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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.
Highlighted products: Constant Contact, Instantly, Apollo.io, lemlist, Brevo Marketing Platform, Warmy, Klaviyo, and Intuit Mailchimp Email Marketing.
Underlying data: [Grid® JSON](https://www.g2.com/categories/email-deliverability/grids.json?focus%5B%5D=constant-contact&focus%5B%5D=instantly&focus%5B%5D=apollo-io&focus%5B%5D=lemlist&focus%5B%5D=brevo-marketing-platform&focus%5B%5D=warmy&focus%5B%5D=klaviyo&focus%5B%5D=intuit-mailchimp-email-marketing)
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.
SenderSignal is email deliverability software that enhances sending reputation, monitors blacklists, and tests inbox placement. It offers automated domain warmup, blacklist monitoring, and inbox placement testing. The Inbox Boost feature automates domain warmup by setting up sending infrastructure, generating SPF, DKIM, and return-path records, and writing DNS entries into registrar accounts. A 28-day ramp increases sending volume while monitoring engagement and bounce rates, pausing if thresholds are exceeded. Blacklist monitoring checks domains and IPs against 45+ sources like Spamhaus and Barracuda, with alerts via Slack, email, webhooks, or PagerDuty. Inbox Intelligence tests placement across Gmail, Microsoft 365, Yahoo, and others, analyzing delivery path, authentication, spam triggers, and readability. A reputation score from zero to 100 traces deductions to blacklist sources or configuration issues. Integration options include a REST API and webhooks for external systems.
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.
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.
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.
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.
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
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!
TagMyMail allows you to use your Gmail account to send out trackable emails. No installation needed and works across both Web and Mobile devices.
