Running 25+ DNS checks against your domain — usually 2-3 seconds…
Running 25+ DNS checks against your domain — usually 2-3 seconds…
Domain check / fastmail.com
Last checked just now
Free email deliverability report for fastmail.com. SPF, DKIM, DMARC, MX, BIMI, MTA-STS, and a 15-blacklist sweep.
DOMAIN HEALTH
fastmail.com
3 ISSUES
0 critical
SPF
v=spf1 include:spf.messagingengine.com ~all
DKIM
Probed 38 selectors, none found
DMARC
p=none
MX
in1-smtp.messagingengine.com, in2-smtp.messagingengine.com
BIMI
not published
MTA-STS
policy present
You are publishing DMARC but not asking receivers to act on failures. Spoofers can impersonate your domain without consequence.
FIX
Once you have monitored RUA reports for 2-4 weeks and confirmed no legitimate traffic fails DMARC, change p=none to p=quarantine. Tighten to p=reject once stable.
Fastmail uses CNAME-based DKIM with selectors fm1/fm2/fm3.
FIX
Fastmail uses CNAME-based DKIM with selectors fm1/fm2/fm3.
Your SPF policy is set to ~all, which only suggests rejection. Receivers may still deliver spoofed mail.
FIX
Once you are confident your SPF is correct, harden the policy to -all (hard fail).
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THE FIX
We found 3 issues on fastmail.com. Want us to fix it and keep it fixed? Connect your inbox and we handle the rest: authentication, warm-up, and a deliverability gate on every send.
Fix this free →This page shows the current deliverability posture of fastmail.com. Check your own domain free, or connect your inbox and we fix it and keep it fixed.