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Sendmux vs Fromseal

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 Fromseal
DetailSendmux logo SendmuxFromseal logo Fromseal
What it doesEmail API that gives AI agents a real inbox with send, receive, and routing capabilities Email authentication monitoring and management platform that reads DMARC reports, checks DNS daily, and fixes SPF automatically
StageNot given Not given
FoundedNot given Not given
Based inNot given Not given
Pricing modelNot given Freemium
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. Not given
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%
  • DMARC report processing and plain English interpretation
  • Daily DNS checks for DMARC, SPF, DKIM, BIMI, MTA-STS and TLS-RPT
  • Sender identification and approval workflow
  • SPF analyzer, builder and managed SPF include
  • Enforcement assistant for policy escalation
  • Alerts by email, Slack, Microsoft Teams and webhook
  • Multi-client portfolio and white-label reports
  • REST API access
  • MCP server for AI client integration
  • Command line tool for terminal and CI/CD
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
  • Identifies senders by name rather than IP addresses
  • Safe DNS changes with preview, confirmation and rollback
  • Managed SPF that updates automatically every hour
  • Works with existing DMARC tools without requiring a switch
Community votes00
DR (Domain Rating by Ahrefs)39 no change since last checkNot checked yet no change since last check
Trust Flow (Majestic)280
Citation Flow (Majestic)350
Referring domains (Majestic)2410

3 details filled in for both companies.

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