Is fastmail.fm a valid email domain?
Mail for fastmail.fm is handled by 2 servers at Fastmail, with in1-smtp.messagingengine.com tried first.
It is a free, public mailbox provider, and it is not on our disposable list.
SPF is published and ends with ~all. DMARC is set to none.
Check an email address at fastmail.fm
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MX records (Fastmail)
| Priority | Mail server | Resolves to |
|---|---|---|
| 10 | in1-smtp.messagingengine.com | 103.168.172.217, 103.168.172.216 |
| 20 | in2-smtp.messagingengine.com | 202.12.124.217, 202.12.124.216 |
SPF
Record published
v=spf1 include:spf.messagingengine.com ~all
DMARC
Policy: none
v=DMARC1; p=none; rua=mailto:e3936a44@inbox.ondmarc.com
Disposable?
No, not on our disposable list.
Free provider?
Yes, a free public mailbox provider.
What this means for your email list
Is a free-provider address a problem?
No: plenty of genuine customers use fastmail.fm. For business-to-business sales a free address can mean a personal contact instead of a work one, so segment these separately if that matters to you. The address itself still needs checking for typos and dead mailboxes.
Sender authentication
fastmail.fm has DMARC in monitoring mode (p=none). It collects reports but does not yet block spoofed mail, so the domain is easier to impersonate.
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Sign up to get a report summary →Frequently asked questions
- Is fastmail.fm a valid email domain?
- Yes. fastmail.fm publishes 2 MX records and can receive email. Whether a particular mailbox exists is a separate question that only a mailbox check can answer.
- Is fastmail.fm a disposable email domain?
- No. fastmail.fm is not on our disposable list, but it is a free public provider. The list is updated regularly, and new throwaway domains appear all the time.
- What are the MX records for fastmail.fm?
- in1-smtp.messagingengine.com (priority 10); in2-smtp.messagingengine.com (priority 20).
- Does fastmail.fm have SPF and DMARC?
- SPF: yes, ending ~all. DMARC: yes, policy none.