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Sendmux vs Mails.ai

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

Sendmux compared with Mails.ai
DetailSendmux logo SendmuxMails.ai logo Mails.ai
What it doesEmail API that gives AI agents a real inbox with send, receive, and routing capabilities Email infrastructure for AI agents
StageNot given Startup
FoundedNot given Not given
Based inNot given Not given
Pricing modelNot given Not given
PricingFree: $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. Free: 3,000 emails + 3,000 inbound replies/month; Pro: $20/month for 50K emails + 50K inbound replies; Scale: $99/month for 250K emails + 500K inbound replies. Yearly billing available: Pro $200/year, Scale $990/year (two months free).
Key features
  • 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%
  • Per-agent email addresses on your domain
  • Native prompt-injection scanning on every inbound
  • Per-agent reputation graph
  • Typed reply events without raw MIME parsing
  • MCP-native distribution
  • Self-serve signup with no sales call
  • TypeScript and Python SDKs
  • HMAC-signed webhooks with retries
  • Per-agent allowlist and send limits
  • DKIM signing on custom domains
What makes it different
  • 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
  • No approval queue—sending works immediately on signup
  • Prompt-injection scanning built into every inbound message
  • Per-agent reputation tracking so each agent is scored independently
Community votes00
DR (Domain Rating by Ahrefs)39 no change since last check29 no change since last check
Trust Flow (Majestic)288
Citation Flow (Majestic)3536
Referring domains (Majestic)241406

4 details filled in for both companies.

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