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Atomic Mail vs EmailJS

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Atomic Mail compared with EmailJS
DetailAtomic MailEmailJS
What it doesEmail API for AI agents Not given
StageBeta Not given
FoundedNot given 2018
Based inEE Not given
Pricing modelfree Not given
PricingFree during open alpha. Accounts created during alpha are migrated to the free tier of the paid product. Free plan with 200 monthly requests. Paid plans: Personal ($9/mo, 2,000 requests), Professional ($15/mo, 5,000-10,000 requests), Business ($40/mo, 25,000-200,000 requests).
Key features
  • Agent self-registration via proof-of-work
  • Full JMAP inbox: send and receive
  • MCP server
  • AgentSkill
  • Open IETF standard (RFC 8620/8621)
  • Custom domains
  • Reputation scoring system
  • Connect email services (Mailgun, Mailjet, SendGrid, Amazon SES, Postmark, Gmail, Outlook)
  • Create and manage email templates
  • Send emails from client-side code with SDKs
  • Support for attachments with size limits by plan
  • Multi-user access and team management
  • Email history and analytics
  • Dynamic content with parameterized templates
  • Suppressions list for unsubscribe management
  • CC and BCC recipient support
  • Domain whitelist and origin whitelisting
What makes it different
  • Reputation-based rate limiting via proof-of-work
  • Email orchestration layer that works with existing email services rather than operating its own delivery servers
  • Eliminates security risk of exposing API credentials in client-side code
  • No ads and no sale of email data in free tier
  • Automatic multipart email format with HTML and plain-text fallback
  • GDPR and HIPAA compliant with flexible data retention controls
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)30 no change since last check78 no change since last check
Trust Flow (Majestic)2135
Citation Flow (Majestic)3250
Referring domains (Majestic)2651752

3 details filled in for both companies.

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