Email domain check
Is posteo.de a disposable email domain?
No: posteo.de is a free email provider. Here is what that means for your signup form, with mail-server data checked in Oct 2026.
No. posteo.de is a free email provider. Signups from it are real people, but one person can hold many addresses.
posteo.de at a glance
| Check | Result |
|---|---|
| Type | Real mailbox provider |
| On the disposable list | No |
| MX records | mx01.posteo.de, mx02.posteo.de, mx03.posteo.de, mx04.posteo.de |
| Mail operator | Not identified |
| Same inbox as | posteo.de |
| Ignores dots in the name | No |
| +tag aliases reach the same inbox | Yes |
| Checked | Oct 2026 |
Signups from posteo.de: real people, repeat trials
posteo.de is not disposable, so blocking it would turn away genuine customers. The risk is different: the same person signing up again and again to restart a free trial. A +tag (jane+7@posteo.de) reaches the same inbox as the plain address.
Try it in the Gmail alias checker, or see how Vetto flags alias farms on the landing page.
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Frequently asked questions
Is posteo.de a disposable email domain?
No. posteo.de is a regular mailbox provider. People keep these inboxes for years, so a signup from posteo.de is a reachable person.
Can one posteo.de user sign up many times?
Yes, through +tags (jane+2@posteo.de) or by opening extra accounts. Vetto strips +tags to spot the same inbox signing up again.
Should I allow posteo.de on a B2B signup form?
Usually yes: founders and freelancers sign up with personal addresses. If you only sell to companies, Vetto's work-email policy can warn or block free providers like posteo.de without touching anything else.
Give your signup form sharp eyes.
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