Listed alphabetically. A tool is ranked by its reviews once it has 3.
| Tool | Reviews | Lowest paid plan | Free plan | Free trial | Public API | Runs on | Main features |
|---|---|---|---|---|---|---|---|
 Barracuda Email ProtectionA complete email security solution with AI-enhanced defenses, automated response and easy deployment. | ReviewsNone yetWrite one for Barracuda Email Protection | Lowest paid planNot confirmed | Free planNot confirmed | Free trialNot confirmed | Public APIYes | Runs onNot confirmed | Main features
|
 dmarcianGives internet domain owners control over their email domains with DMARC. | ReviewsNone yetWrite one for dmarcian | Lowest paid plan$24per month, billed monthlyBasic, as of November 14, 2026 | Free planYes | Free trial30 days | Public APIYes | ||
 EasyDMARCAn all-in-one DMARC platform that helps secure communications and stay compliant. | ReviewsNone yetWrite one for EasyDMARC | Lowest paid plan$35.99per month, billed annuallyDMARC Plus, as of November 14, 2026 | Free planNot confirmed | Free trialYes | Public APIYes | ||
 IronscalesAI email security that stops phishing and business email compromise. | ReviewsNone yetWrite one for Ironscales | Lowest paid planNot confirmed | Free planNot confirmed | Free trialYes | Public APIYes | Runs onMicrosoft 365, Google Workspace, Microsoft Teams | |
 Material SecurityPhishing protection, account takeover prevention, and email DLP for Google Workspace and Microsoft 365. | ReviewsNone yetWrite one for Material Security | Lowest paid plan$4per user per month, billed annually, plus a fee based on Shared Drive sizeEssentials, as of November 14, 2026 | Free planNot confirmed | Free trialYes | Public APIYes | ||
 MimecastMimecast is a cybersecurity and governance platform. | ReviewsNone yetWrite one for Mimecast | Lowest paid planSee plans | Free planNot confirmed | Free trialNot confirmed | Public APIYes | Runs onMac, Windows, Linux | Main features |
 PowerDMARCA complete DMARC service for email authentication, deliverability, reputation, and DNS compliance. | ReviewsNone yetWrite one for PowerDMARC | Lowest paid plan$8per month, from $8 for 50,000 emails per month, up to $250Basic, as of November 14, 2026 | Free planYes | Free trial15 days | Public API | ||
 Sublime SecurityAgentic email security tailored to your organization. | ReviewsNone yetWrite one for Sublime Security | Lowest paid planNot confirmed | Free planYes | Free trialNot confirmed | Public APIYes | Runs onNot confirmed |
From each tool's own website. “Not confirmed” means we couldn't confirm it there, not that the tool doesn't have it. Each tool's page says when its facts were checked.
How this list is made
A tool is listed here only when we've confirmed on its own website that it has a public API. Tools we couldn't confirm it for are left out, even if they may have it. Vendors can't pay for a place on this list. Add a tool we missed