Best Secure Email Gateway Software - Page 5

How Many Secure Email Gateway Software Products Does G2 Track?

Total Products under this Category: 97

Category Stats (Nov 2026)

  • Average Rating: 4.48/5 The average rating of products in this category, based on all submitted ratings
  • Top Trending Product: Microsoft Exchange (+0.16%) - Among all products in this category, Microsoft Exchange recorded the largest rating increase compared to last month

Last updated: November 01, 2026

How Does G2 Rank Secure Email Gateway Software Products?

Why You Can Trust G2's Software Rankings:

  • 30 Analysts and Data Experts
  • 3,600+ Authentic Reviews
  • 97+ 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.

G2 Grid® for Secure Email Gateway Software

G2 Grid® for Secure Email Gateway Software plotting products by satisfaction and market presence

Highlighted products: Proofpoint Core Email Protection, Paubox, Microsoft Exchange, Mimecast Advanced Email Security, Sophos Email, LibraCyber Email Security, Cloudflare One (SASE), and FortiMail.

Underlying data: [Grid® JSON](https://www.g2.com/categories/secure-email-gateway/grids.json?focus%5B%5D=proofpoint-core-email-protection&focus%5B%5D=paubox&focus%5B%5D=microsoft-microsoft-exchange&focus%5B%5D=mimecast-advanced-email-security&focus%5B%5D=sophos-email&focus%5B%5D=libracyber-email-security&focus%5B%5D=cloudflare-one-sase&focus%5B%5D=fortimail)

InboxSeguro Platform

InboxSeguro gives companies visibility and control over every system that sends email using their domain. It builds an inventory of sending systems from DMARC reports (detected via PTR/ASN and DKIM), where you can assign an owner and a status (approved, inactive, review) to each one. It alerts when a new sender appears, when volume falls outside the expected monthly range, or when SPF/DKIM failures suggest a possible spoofing attempt. It also detects forwarding, monitors DNS status, and checks the domain hourly against 6 major spam blacklists (such as Spamcop and Barracuda), with guidance to request removal if listed. Guided DNS setup with an AI assistant helps move safely from p=none to quarantine or reject. Each month it generates a technical report and a governance PDF that supports internal reviews and audits. Built for B2B, e-commerce and SaaS companies in Latin America, with setup in Spanish.

Who Is the Company Behind InboxSeguro Platform?

inDefend

inDefend is a unified data protection and insider risk management platform from Data Resolve Technologies, a focused Data Security and Insider Threat Management company providing solutions using cutting-edge, advanced, AI/ML techniques to protect, prevent and predict threats to your data anywhere. In addition, the product enables C-Level executives to ensure complete security, productivity of employees independent of when and where they work and continuous access monitoring & control. Our platform enables organizations to gain complete visibility and control over sensitive data across endpoints, networks, and cloud environments, helping them stay compliant and secure.

Average Rating: 4.0/5.0

Total Reviews: 1

How Do G2 Users Rate inDefend?

  • Has the product been a good partner in doing business?: 8.3/10 (Category avg: 8.8/10)

Who Is the Company Behind inDefend?

Who Uses This Product?

  • Company Size: 100% Large

What Are Recent G2 Reviews of inDefend?

iNODE Connectware

A modular software platform that simplifies an organization’s day to day infrastructure by covering all digital connectivity and communication needs. iNODE platform embraces all the basic network applications a modern business need. Run privately your corporate services like Email, File Sharing, VPN, Proxy & Fax , with significant lower cost compared to other solutions. iNODE is provided either as s Software product or as a subscription based SaaS service over Cyano Cloud by Dataways.

Who Is the Company Behind iNODE Connectware?

  • Seller: Dataways
  • Year Founded: 2000
  • HQ Location: Thessaloniki, GR
  • LinkedIn® Page: www.linkedin.com
    19 employees on LinkedIn®

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Inxmail

Inxmail is the service-oriented tech specialist for secure, data-driven communication in email marketing. With the modular email marketing platform and excellent service over 2,000 customers realize campaigns and trigger-based transactional emails that ensure sustainable business success. The basis is the potential of your data, simple email creation combined with reliable delivery. Inxmail supports companies to turn recipients into enthusiastic customers since 1999. Since its founding, the principles of the owner-managed company with headquarters in Freiburg have been based on innovation, reliability, and customer proximity. Continuous development of the portfolio and the organization ensure growth and future security. Inxmail places the highest value on data security, legal certainty and hosts its servers exclusively in the EU. As a founding member of the Certified Senders Alliance (CSA), Inxmail has been committed to permission-based email marketing from the very beginning.

Average Rating: 2.0/5.0

Total Reviews: 1

Who Is the Company Behind Inxmail?

  • Seller: Inxmail
  • Year Founded: 1999
  • HQ Location: Freiburg, DE
  • LinkedIn® Page: www.linkedin.com
    115 employees on LinkedIn®

Who Uses This Product?

  • Company Size: 100% Medium

What Are G2 Users Discussing About Inxmail?

Janusmail

Every day Mailboxes and servers are subjects to phishing, spam, ransomware, viruses and malware attacks. JANUSMAIL is a new concept product, the result of 20 years of experience in the electronic mail management, created for: - Protect emails and servers from attacks and spam - Identify and resolve forwarding/receiving problems - Manage massive amunts of emails without slowdowns - Integrate seamlessly with Zimbra servers - In-depth analysis of incoming and outgoing emails - Include specific features for service providers

Who Is the Company Behind Janusmail?

Kaspersky Security for Mail Server

Kaspersky Security for Mail Server (KSMS) provides trusted and secure corporate email exchange, countering spam, email-borne infections, all forms of phishing, business email compromise (BEC), QR code attacks, and other threats. Kaspersky Security for Mail Server delivers multi-layered protection for the business’s primary communications channel — email — countering spam, malware, spoofing, all forms of phishing and other threats. Whether you use on-prem email tools or cloud, KSMS ensures secure corporate email exchange, helping reduce the risk of business disruption, financial losses and data leaks. - Fortify your email infrastructure defense Keep your business’s primary communications channel secure with a single product, powered by proactive detection, advanced content filtering and response. - Mitigate email-borne risks to your business Protect against all types of email threats and minimize the risk of disruption, financial loss and data leaks with a robust email security solution. - Ensure cost efficiency of your investments Benefit from three advanced mail security applications under a single license, with a flexible subscription model that helps you control and optimize costs. - Full protection for both cloud and on-prem Whether you use on-prem tools or cloud, select from our wide range of options - from secure email gateway to API-integrated on-prem or cloud-native email security

Who Is the Company Behind Kaspersky Security for Mail Server?

  • Seller: Kaspersky
  • Year Founded: 1997
  • HQ Location: Moscow
  • LinkedIn® Page: www.linkedin.com
    4,616 employees on LinkedIn®
  • Phone: 1-866-328-5700

KeepKnown

KeepKnown is an allow-list email filter for Gmail, Outlook, and Microsoft 365. It automatically filters unknown senders out of your inbox without deleting them, ensuring you only see emails from people you know and trust. Google Verified with CASA Tier 2 security certification. The strict inbox filter that keeps your focus on what matters.

Who Is the Company Behind KeepKnown?

MailArmor

MailArmor.ai is an AI-powered email security platform for SMBs in India. It integrates with Microsoft 365 in 5 minutes, complies with CERT-In & DPDP, and protects against phishing, malware, and BEC.

Who Is the Company Behind MailArmor?

MailHippo

MailHippo empowers users to start sending and receiving fully-encrypted emails and fillable, signable HIPAA compliant forms within minutes. Designed for ease of use, MailHippo works with any email provider, using your existing email address, with no setup or configuration required. It’s simple yet incredibly strong, with AES 256-bit end-to-end encryption, plus encrypted key rings, for industry-leading security both in transit and at rest. And it’s totally mobile friendly, working well on any smartphone or tablet.

Who Is the Company Behind MailHippo?

Mail Shield

Mail Shield is a fully-managed email security gateway that sits between the internet and your mail server, inspecting every inbound and outbound message before it is delivered. It blocks phishing, spear-phishing, malware and ransomware attachments, spam, spoofing and business email compromise (BEC) at the network edge - before anyone can act on them. Unlike the broad, compatibility-first defaults of built-in filters, Mail Shield is tuned and reviewed continuously by Australian engineers. Outbound filtering catches compromised accounts and protects your sending reputation so your IP does not land on blacklists, and the gateway enforces SPF, DKIM and DMARC alignment to your policy. Key features: - Inbound + outbound filtering (phishing, malware, spam, BEC, impersonation) - Dedicated spam quarantine with daily user digests and self-service release - SPF/DKIM/DMARC enforcement and anti-spoofing - Australian-hosted infrastructure - no data routed offshore (Privacy Act / data-sovereignty friendly) - Specialist-managed, not a self-service portal - tuned by the engineers who run it - Fast setup: change your MX records and you are protected, usually within the hour Pricing from AUD $25 per user per month, with no lock-in contract and no setup fee. Suits any business running Microsoft 365, Exchange or Linux/Postfix mail that wants stronger, hands-on protection than built-in defaults provide.

Who Is the Company Behind Mail Shield?

MetaDefender Email Gateway Security

MetaDefender™ Email Gateway Security is OPSWAT’s on-premises email gateway security solution for protecting organizations from phishing, ransomware, zero-day, and AI-generated email threats. It is built for enterprise, regulated, and critical infrastructure environments where teams need advanced email protection, encrypted and password-protected attachment inspection, policy enforcement across IT and OT workflows, and support for on-premises, disconnected, and air-gapped deployments. MetaDefender Email Gateway Security is deployed at the SMTP/MX level and provides security across inbound and outbound email workflows. It applies Metascan™ Multiscanning, Deep CDR™ technology, AI-powered malware analysis through Predictive Alin AI, MetaDefender Aether™ emulation-based sandboxing, phishing and spam detection, and Proactive DLP™ to identify sensitive information across email workflows. The solution takes a prevention-first, layered approach to email security, inspecting links, attachments, and message content before delivery. It applies deeper analysis when risk warrants it, helping legitimate email move efficiently while subjecting suspicious content to additional scrutiny. MetaDefender Email Gateway Security also addresses the risks associated with encrypted and password-protected attachments. It can locate passwords included in the email body and automatically inspect, sanitize, and sandbox protected files. If a password is unavailable, the user can provide it through a self-service portal, enabling further processing without requiring manual validation from IT or SOC teams. For data protection and governance, Proactive DLP™ can detect and redact sensitive information, such as PII, PHI, and credentials. Centralized policy controls, reporting, audit trails, and documented inspection and sanitization outcomes help organizations demonstrate control effectiveness and support compliance initiatives, including GDPR, DORA, and NIS2. The solution integrates with Microsoft Exchange Server, Microsoft 365, Google Workspace, MetaDefender Managed File Transfer, and any SMTP-based email gateways and mail servers. It can be deployed in front of existing mail servers or as an additional security layer alongside an existing email gateway, allowing organizations to strengthen protection without replacing established platforms or disrupting email workflows. Results include a 99.98% detection rate for spam and phishing attacks using on-arrival and time-of-click analysis from 30+ online sources, more than 99.2% malware detection through 30+ anti-malware engines, Deep CDR support for over 200 file types, MetaDefender Aether™ zero-day detection of over 99%, Predictive Alin AI verdicts in less than 100 ms with a 0.1% false positive rate, and Proactive DLP redaction and anonymization across 125+ file types.

Who Is the Company Behind MetaDefender Email Gateway Security?

  • Seller: OPSWAT
  • Company Website:
  • Year Founded: 2002
  • HQ Location: Tampa, Florida
  • LinkedIn® Page: www.linkedin.com
    1,185 employees on LinkedIn®

m-FILTER

Who Is the Company Behind m-FILTER?

Lauren Worth
LW
Researched and written by Lauren Worth
Updated October 3, 2024