Atomic Mail vs DKIMValidator.com

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 DKIMValidator.com
Detail	Atomic Mail	DKIMValidator.com
What it does	Email API for AI agents	DKIM, SPF, SpamAssassin Email Validator
Stage	Beta	Not given
Founded	Not given	Not given
Based in	EE	Not given
Pricing model	free	free
Pricing	Free 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	Validate DKIM configuration Check SPF validity Measure SpamAssassin score DNS record lookups from authoritative servers Retest without resending messages
What makes it different	Reputation-based rate limiting via proof-of-work	Tests show the same headers recipients will see Minimizes DNS caching delays during testing Keep current SpamAssassin rules with daily updates
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	30 no change since last check	67 no change since last check
Trust Flow (Majestic)	21	39
Citation Flow (Majestic)	32	37
Referring domains (Majestic)	265	720

4 details filled in for both companies.