postmarkapp.com
Live email deliverability and anti-spoofing audit. Every value below was read from public DNS at the moment this page was generated.
91/100 — This domain is configured correctly for both sending and receiving. Accepts mail · Protected against spoofing · Hosted by Google Workspace
Findings
-
spf
SPF ends in ~all (softfail); unauthorised mail is marked rather than rejected.
v=spf1 a mx include:spf.mtasv.net include:_spf.google.com include:cmail1.com include:mail.zendesk.com include:helpscoutemail.com ~all
Fix: Move to -all once you have confirmed all senders are listed.
-
mta sts
No MTA-STS policy, so inbound mail can be downgraded to an unencrypted connection.
Fix: Publish _mta-sts.postmarkapp.com and host a policy at https://mta-sts.postmarkapp.com/.well-known/mta-sts.txt.
-
mx
Mail is handled by Google Workspace.
10 aspmx.l.google.com, 20 alt1.aspmx.l.google.com, 20 alt2.aspmx.l.google.com, 30 aspmx2.googlemail.com, 30 aspmx3.googlemail.com
-
dmarc
DMARC is enforcing with p=reject.
v=DMARC1; p=reject; pct=100; rua=mailto:re+j1puxgl6ln5@inbound.dmarcdigests.com; sp=none;
-
dkim
DKIM keys found for 2 selectors.
google._domainkey, pm._domainkey
Records
| MX | 10 aspmx.l.google.com20 alt1.aspmx.l.google.com20 alt2.aspmx.l.google.com30 aspmx2.googlemail.com30 aspmx3.googlemail.com |
|---|---|
| SPF | v=spf1 a mx include:spf.mtasv.net include:_spf.google.com include:cmail1.com include:mail.zendesk.com include:helpscoutemail.com ~all |
| DMARC | v=DMARC1; p=reject; pct=100; rua=mailto:re+j1puxgl6ln5@inbound.dmarcdigests.com; sp=none; |
| DKIM selectors | google, pm |
| MTA-STS | not published |
| TLS-RPT | not published |
| BIMI | not published |
| DNSSEC | not validating |
Same data, as JSON, in one request. No SMTP probing, no stored recipient data, 250 free calls a month.
curl "https://mailgrade.dev/v1/domain?domain=postmarkapp.com"
Also available: /v1/verify?email=… for individual addresses, and
/v1/verify/batch for lists.