medium.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
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spf
SPF ends in ~all (softfail); unauthorised mail is marked rather than rejected.
v=spf1 include:amazonses.com include:_spf.google.com include:mail.zendesk.com include:sendgrid.net include:spf.tipalti.com include:_spf.psm.knowbe4.com ~all
Fix: Move to -all once you have confirmed all senders are listed.
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mta sts
No MTA-STS policy, so inbound mail can be downgraded to an unencrypted connection.
Fix: Publish _mta-sts.medium.com and host a policy at https://mta-sts.medium.com/.well-known/mta-sts.txt.
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mx
Mail is handled by Google Workspace.
1 aspmx.l.google.com, 5 alt1.aspmx.l.google.com, 5 alt2.aspmx.l.google.com, 10 aspmx2.googlemail.com, 10 aspmx3.googlemail.com
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dmarc
DMARC is enforcing with p=reject.
v=DMARC1; p=reject; sp=reject; pct=100;fo=1; ri=3600; rua=mailto:dmarc.rua@medium.com; ruf=mailto:dmarc.rua@medium.com,mailto:ruf@dmarc.medium.com
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dkim
DKIM keys found for 4 selectors.
google._domainkey, s1._domainkey, s2._domainkey, mandrill._domainkey
Records
| MX | 1 aspmx.l.google.com5 alt1.aspmx.l.google.com5 alt2.aspmx.l.google.com10 aspmx2.googlemail.com10 aspmx3.googlemail.com |
|---|---|
| SPF | v=spf1 include:amazonses.com include:_spf.google.com include:mail.zendesk.com include:sendgrid.net include:spf.tipalti.com include:_spf.psm.knowbe4.com ~all |
| DMARC | v=DMARC1; p=reject; sp=reject; pct=100;fo=1; ri=3600; rua=mailto:dmarc.rua@medium.com; ruf=mailto:dmarc.rua@medium.com,mailto:ruf@dmarc.medium.com |
| DKIM selectors | google, s1, s2, mandrill |
| 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=medium.com"
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/v1/verify/batch for lists.