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Conduit vs Email Spam Tester

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

Conduit compared with Email Spam Tester
DetailConduitEmail Spam Tester
What it doesTurn any email into a webhook Test real inbox placement and 42 technical checks with no signup required
StageNot given Established
FoundedNot given 2026
Based inNot given Not given
Pricing modelfree freemium
PricingNot given Not given
Key features
  • Email in, webhooks out
  • Reliable by design with SMTP retry
  • Secure payloads with HMAC-SHA256 signing
  • Domain ownership verification
  • Per-webhook rate limiting
  • Custom payload templates
  • Custom request headers
  • Full delivery history
  • Real inbox placement testing in Gmail, Outlook, Yahoo and more
  • 42 technical checks across authentication, infrastructure, content and compliance
  • SPF, DKIM and DMARC verification
  • Blocklist lookup across 20+ DNS blocklists
  • SpamAssassin-compatible spam score
  • Link reputation checking
  • HTML structure analysis
  • Bulk sender rules for Gmail and Yahoo compliance
  • Fix plan with recomputed score for corrections
  • API and MCP server integration options
What makes it different
  • No polling or mail libraries required
  • Never stores email content
  • Fine-grained SMTP error control from webhooks
  • Two independent spam engine scores instead of one, including Gmail and Yahoo 2024 bulk sender rules
  • Fix plan recomputes points by scoring corrected message rather than estimating
  • No account, signup or credit card required to run tests
  • Built by practitioner with years of live sending infrastructure debugging experience
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)4 no change since last check18 no change since last check
Trust Flow (Majestic)917
Citation Flow (Majestic)2325
Referring domains (Majestic)5235

4 details filled in for both companies.

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