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Checking SPF, DMARC, DKIM, MX, DNS, blacklists and domain & SSL expiry. A domain we haven't scanned before takes a few seconds — hang tight.
Checking SPF, DMARC, DKIM, MX, DNS, blacklists and domain & SSL expiry. A domain we haven't scanned before takes a few seconds — hang tight.
Scanned Jul 21, 2026 22:36 UTC · 7 checks · public report
Solid base — two policy steps remain.
postmarkapp.com publishes an enforcing DMARC policy, so mail that forges its domain is quarantined or rejected at the recipient.
Your SPF setup is currently in “soft fail” mode at the end, which means other mail servers are only being told to treat unexpected senders with caution rather than reject them. This matters because it makes it easier for attackers to spoof your domain in email, which can hurt deliverability and trust. The fix is to switch the final SPF rule to a strict reject mode after you’ve confirmed every legitimate sending service is included.
v=spf1 a mx include:spf.mtasv.net include:_spf.google.com include:cmail1.com include:mail.zendesk.com include:helpscoutemail.com ~allEdit your SPF record at Amazon Route 53 — step-by-step guide.
Your email authentication is using a DKIM key that is too short, which makes it weaker than recommended. This matters because weaker keys are easier to break, so email spoofing and tampering are harder to defend against. The fix is to replace that DKIM key with a stronger, longer key and update the DKIM setup for the affected selector.
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