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mail.tm vs mailboxlayer

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

APImail.tmNEW—mailboxlayerNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — temporary mailboxesFree tier — key may be required
Rate limitRate limited (429 on exceed); exact policy per docs.mail.tmUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

mail.tm vs mailboxlayer: common questions

Which is more reliable, mail.tm or mailboxlayer?

On our scheduled checks, mailboxlayer leads on measured uptime — mail.tm at —% versus mailboxlayer 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 mailboxlayer need an API key?

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

Can I call mail.tm and mailboxlayer from the browser?

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

Are mail.tm and mailboxlayer free for commercial use?

mail.tm has unclear commercial terms, and mailboxlayer 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.