Email domain check
Is fastmail.com a disposable email domain?
No: fastmail.com is a free email provider. Here is what that means for your signup form, with mail-server data checked in Oct 2026.
No. fastmail.com is a free email provider with mail handled by Fastmail. Signups from it are real people, but one person can hold many addresses.
fastmail.com at a glance
| Check | Result |
|---|---|
| Type | Real mailbox provider |
| On the disposable list | No |
| MX records | in1-smtp.messagingengine.com, in2-smtp.messagingengine.com |
| Mail operator | Fastmail |
| Same inbox as | fastmail.com |
| Ignores dots in the name | No |
| +tag aliases reach the same inbox | Yes |
| Checked | Oct 2026 |
Signups from fastmail.com: real people, repeat trials
fastmail.com 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@fastmail.com) 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.
Common typos of fastmail.com
A mistyped domain means the person never receives your welcome email. Vetto catches these and offers a one-click fix to fastmail.com:
afstmail.com→fastmail.comfsatmail.com→fastmail.comfatsmail.com→fastmail.comfasmtail.com→fastmail.comfastamil.com→fastmail.comfastmial.com→fastmail.com
Test your own in the email typo checker.
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See all 140 domains we checked on the email domain index.
Frequently asked questions
Is fastmail.com a disposable email domain?
No. fastmail.com is a regular mailbox provider (mail handled by Fastmail). People keep these inboxes for years, so a signup from fastmail.com is a reachable person.
Can one fastmail.com user sign up many times?
Yes, through +tags (jane+2@fastmail.com) or by opening extra accounts. Vetto strips +tags to spot the same inbox signing up again.
Should I allow fastmail.com 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 fastmail.com without touching anything else.
Give your signup form sharp eyes.
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