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mail.tm vs Telnyx API

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

APImail.tmHEALTHY82Telnyx APIHEALTHY97
Uptime · 30d
Uptime · 90d84.3%100%
Uptime · 30d75.0%100%
P50 · ms709246
P95 · ms2351570
AuthnoneapiKey
CORSnoyes
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 84.3% versus Telnyx API at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, mail.tm or Telnyx API?

Telnyx API has the lower median latency in our checks — mail.tm responds in 709 ms versus Telnyx API at 246 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

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?

Only Telnyx API is browser-friendly — it returns CORS headers over HTTPS. mail.tm needs a server-side call or proxy, so factor that into which one fits a front-end project.

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.