Will email sent to a mail.tm address be delivered?

Often yes, right now — and that is the trap. While the inbox is live the mail server accepts messages normally, so the address verifies as deliverable on any tool that only checks DNS and the mailbox. It stops being read once the until the owner deletes it window closes, so the delivery is real and the relationship is not.

Should I block signups from mail.tm?

For a paid product or a free trial, yes — a throwaway address is the standard way to farm repeat trials and there is no way to reach that user again. For a content signup it is a judgement call, since some people use throwaways for legitimate privacy reasons. A middle path is to accept the signup but require a confirmed permanent address before granting anything valuable.

Disposable — blocked

Is mail.tm a disposable email address?

Yes. mail.tm is Mail.tm, a temporary email service. Addresses at it typically last until the owner deletes it, then stop being read. It is one of 8,740 disposable domains SimpleVerifier blocks, so any address here is returned as invalid rather than valid.

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Address lifetime: Until the owner deletes it
Inbox privacy: Private to the session
Our verdict: Invalid

About Mail.tm

Unlike most throwaways, a Mail.tm mailbox is password-protected and kept until its owner deletes it, and the service offers an API for creating mailboxes in bulk. That makes it a common source of scripted signups rather than one-off ones.

Other domains from the same provider

Disposable services deliberately run many domains, so a blocklist containing only the brand name catches a fraction of the traffic. These are 12 more domains on our list that appear to belong to Mail.tm:

0-mail.com
0-mailer.dynv6.net
000-webmail.myhome-server.de
000webmail.ddnss.de
000webmail.ddnss.org
000webmail.dyn-ip24.de
000webmail.dyn.ddnss.de
000webmail.dyn.home-webserver.de
000webmail.dyndns.ddnss.de
000webmail.dyndns1.de
000webmail.home-webserver.de
0clickemail.com

Why it verifies as deliverable anyway

While the inbox is live, mail.tm behaves like any ordinary mail host. It has valid MX records, it accepts mail, and the mailbox exists. A verifier that checks syntax, DNS and the mailbox will report the address as valid — correctly, on the evidence available.

That is why disposable detection has to be a separate check against a maintained list, and why the size of that list is the whole product. Nothing in the address or the SMTP conversation reveals that the mailbox is about to be discarded.

Common questions

Is mail.tm a disposable email address?: Yes. mail.tm is Mail.tm, a temporary email service. Addresses at it typically last until the owner deletes it, after which mail sent to them stops being read. It is one of 8,740 disposable domains SimpleVerifier blocks, so any address at it is classified invalid rather than valid.
Will email sent to a mail.tm address be delivered?: Often yes, right now — and that is the trap. While the inbox is live the mail server accepts messages normally, so the address verifies as deliverable on any tool that only checks DNS and the mailbox. It stops being read once the until the owner deletes it window closes, so the delivery is real and the relationship is not.
Should I block signups from mail.tm?: For a paid product or a free trial, yes — a throwaway address is the standard way to farm repeat trials and there is no way to reach that user again. For a content signup it is a judgement call, since some people use throwaways for legitimate privacy reasons. A middle path is to accept the signup but require a confirmed permanent address before granting anything valuable.

Last reviewed 2026-09-11