Will email sent to a guerrillamail.net 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 1 hour window closes, so the delivery is real and the relationship is not.

Should I block signups from guerrillamail.net?

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 guerrillamail.net a disposable email address?

Yes. guerrillamail.net is Guerrilla Mail, a temporary email service. Addresses at it typically last 1 hour, 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.

Part of the same service as Guerrilla Mail.

Seeing guerrillamail.net sign-ups on your own site? How to block disposable emails at signup — or verify your whole list for one flat price.

Address lifetime: 1 hour
Inbox privacy: Private to the session
Our verdict: Invalid

About Guerrilla Mail

Listed in Guerrilla Mail's own domain selector alongside sharklasers.com, grr.la and spam4.me, so it is the same service under another name. The .net version of the main domain.

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 6 more domains on our list that appear to belong to Guerrilla Mail:

guerrillamail.biz
guerrillamail.com
guerrillamail.de
guerrillamail.info
guerrillamail.org
guerrillamailblock.com

Why it verifies as deliverable anyway

While the inbox is live, guerrillamail.net 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 guerrillamail.net a disposable email address?: Yes. guerrillamail.net is Guerrilla Mail, a temporary email service. Addresses at it typically last 1 hour, 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 guerrillamail.net 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 1 hour window closes, so the delivery is real and the relationship is not.
Should I block signups from guerrillamail.net?: 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