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Atomic Mail vs Sender

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 Sender
DetailAtomic MailSender
What it doesEmail API for AI agents Email marketing platform for growing businesses
StageBeta Established
FoundedNot given 2012
Based inEE LT
Pricing modelfree freemium
PricingFree during open alpha. Accounts created during alpha are migrated to the free tier of the paid product. Not given
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
  • Email automation workflows
  • SMS marketing campaigns
  • Landing page builder
  • Segmentation and personalization
  • Transactional emails via API and SMTP
  • A/B testing
  • Analytics and reporting
  • Popup and signup forms
What makes it different
  • Reputation-based rate limiting via proof-of-work
  • Unified platform for email, SMS, and transactional messages
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 check84 no change since last check
Trust Flow (Majestic)2143
Citation Flow (Majestic)3253
Referring domains (Majestic)26510122

6 details filled in for both companies.

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