Is fastmail.com a valid email domain?
Mail for fastmail.com 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.com
Type the name before the @ to check a full address. No account needed.
MX records (Fastmail)
| Priority | Mail server | Resolves to |
|---|---|---|
| 10 | in1-smtp.messagingengine.com | 103.168.172.221, 103.168.172.222 |
| 20 | in2-smtp.messagingengine.com | 202.12.124.218, 202.12.124.219 |
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?
Addresses at fastmail.com are legitimate and deliverable in general. What goes wrong is the mailbox part before the @: typos, old accounts and abandoned inboxes. That is what per-address verification catches.
Sender authentication
fastmail.com 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.com a valid email domain?
- Yes. fastmail.com 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.com a disposable email domain?
- No. fastmail.com 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.com?
- in1-smtp.messagingengine.com (priority 10); in2-smtp.messagingengine.com (priority 20).
- Does fastmail.com have SPF and DMARC?
- SPF: yes, ending ~all. DMARC: yes, policy none.