What it does

It answers one question: is this address actually receiving mail? Enter an email, hit send, and you get a status ID and a delivery timeline - relayed, accepted, bounced or deferred, each step timestamped with the SMTP detail underneath.

That is the difference between guessing and knowing. “It never arrived” can mean a typo, a spam folder, a broken forwarding rule, a DNS problem or a provider rejection, and the timeline tells you which.

Manual tests are free and need no account. Inbox Monitors do: verify an inbox once, pick a schedule, and the same check runs on its own from then on, with an email when a check fails and another when delivery recovers. Signing up is an email address and a link - no password.

How it was built

SendTestMail exists because of AccountProxy. Building an alias email service means creating addresses all day and needing to know whether each one forwards - and everything that existed was an enterprise deliverability suite, when all I wanted was: send one email, tell me what happened.

So I built the small version. Send, trace, confirm. Monitors came later, and from the opposite direction: a one-time test only tells you about one moment, and mail quietly breaks at some point after you stopped looking. An MX record gets edited, a spam filter retrains, and nobody sends you a notice - you find out when a customer mentions they never got the password reset. Monitors close that gap by repeating the same check on a schedule.

Manual test addresses are not stored as raw values, operational data is hashed where possible, and old tests are deleted automatically.

Status

Live and in daily use - over 40,000 test emails sent so far. Inbox Monitors shipped in August 2026. Manual tests stay free; the only limit is rate-limiting against abusive bursts.

Platforms

Web.

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Need support? Visit our support page, or see the portfolio.