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mail.tm vs Telnyx API

Same instrument, two spec sheets — measured, not claimed.

APImail.tmNEW—Telnyx APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — temporary mailboxesFree tier — API key required
Rate limitRate limited (429 on exceed); exact policy per docs.mail.tm50, 50;w=1 req/window · 49 remaining · resets 1
In directory since2026-07-052026-07-05
operationalpartialdownno data

mail.tm vs Telnyx API: common questions

Which is more reliable, mail.tm or Telnyx API?

On our scheduled checks, Telnyx API leads on measured uptime — mail.tm at —% versus Telnyx API at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do mail.tm and Telnyx API need an API key?

mail.tm needs no key, while Telnyx API requires a free API key. If you want to start calling without signup, reach for mail.tm first.

Can I call mail.tm and Telnyx API from the browser?

Yes — both mail.tm and Telnyx API send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are mail.tm and Telnyx API free for commercial use?

mail.tm has unclear commercial terms, and Telnyx API has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.