mailgun.com
Live email deliverability and anti-spoofing audit. Every value below was read from public DNS at the moment this page was generated.
88/100 — Solid configuration with a few gaps worth closing. Accepts mail · Protected against spoofing · Hosted by Microsoft 365
Findings
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mx redundancy
Only one mail exchanger is published, so there is no failover.
mailgun-com.mail.protection.outlook.com
Fix: Add a secondary MX at a higher priority number.
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spf
SPF ends in ~all (softfail); unauthorised mail is marked rather than rejected.
v=spf1 include:_spf.mailgun.org include:_spf.eu.mailgun.org include:spf.protection.outlook.com include:aspmx.pardot.com include:mail.zendesk.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.mailgun.com and host a policy at https://mta-sts.mailgun.com/.well-known/mta-sts.txt.
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mx
Mail is handled by Microsoft 365.
10 mailgun-com.mail.protection.outlook.com
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dmarc
DMARC is enforcing with p=reject.
v=DMARC1; p=reject; sp=reject; pct=100; fo=1; adkim=r; aspf=r;rua=mailto:cc4c1f3a@inbox.ondmarc.com,mailto:dmarc_rua@mailgun.net,mailto:mailgun@dmarc.mailjet.tech,mailto:w8fajs9t@ag.us.dmarcian.com;ruf=mailto:cc4c1f3a@inbox.ondmarc.com,mailto:dmarc@mailgun.net,mailto:mailgun@dmarc.mailjet.tech,mailto:w8fajs9t@fr.us.dmarcian.com
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dkim
DKIM keys found for 4 selectors.
google._domainkey, selector1._domainkey, k1._domainkey, hs1._domainkey
Records
| MX | 10 mailgun-com.mail.protection.outlook.com |
|---|---|
| SPF | v=spf1 include:_spf.mailgun.org include:_spf.eu.mailgun.org include:spf.protection.outlook.com include:aspmx.pardot.com include:mail.zendesk.com ~all |
| DMARC | v=DMARC1; p=reject; sp=reject; pct=100; fo=1; adkim=r; aspf=r;rua=mailto:cc4c1f3a@inbox.ondmarc.com,mailto:dmarc_rua@mailgun.net,mailto:mailgun@dmarc.mailjet.tech,mailto:w8fajs9t@ag.us.dmarcian.com;ruf=mailto:cc4c1f3a@inbox.ondmarc.com,mailto:dmarc@mailgun.net,mailto:mailgun@dmarc.mailjet.tech,mailto:w8fajs9t@fr.us.dmarcian.com |
| DKIM selectors | google, selector1, k1, hs1 |
| 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=mailgun.com"
Also available: /v1/verify?email=… for individual addresses, and
/v1/verify/batch for lists.