MXValidation vs Sendmux

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

MXValidation compared with Sendmux
Detail	MXValidation	Sendmux
What it does	Free email deliverability testing and spam score checker	Email API that gives AI agents a real inbox with send, receive, and routing capabilities
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Freemium	Not given
Pricing	Free account with 10 test emails per 24 hours; guests can access 3 tests per 24 hours	Free: $0/team/month with 2 mailboxes, $1 usage credit, 50 recipients/day. Pro: $7/team/month + usage. Connected outbound: $0.50/1,000 accepted recipients. Managed sending: $0.75/1,000. Inbound: $0.50/1,000 mailbox deliveries. Storage: $0.02/GB/month.
Key features	Deliverability score out of 10	Multi-provider outbound routing with weighted distribution Dedicated inboxes with clean JSON parsing Mailbox-scoped API keys Signed webhooks and Server-Sent Events Per-provider quotas at multiple time windows Unified inbox view for all agent mailboxes Message parsing reducing LLM token usage by 80%
What makes it different	Free service with no credit card required Tests real messages through your actual sending platform Provides practical, actionable recommendations	Brings your own email providers with automatic routing and failover instead of platform lock-in Reduces LLM token consumption by up to 80% with structured JSON parsing and content cleaning Multi-tenant architecture with mailbox-scoped credentials for agent isolation
Community votes	0	0
DR (Domain Rating by Ahrefs)	Not checked yet no change since last check	39 no change since last check
Trust Flow (Majestic)	2	28
Citation Flow (Majestic)	10	35
Referring domains (Majestic)	11	241

4 details filled in for both companies.

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