All tools

DNS lookup
Every record for a domain, blocklists for an IP
Trust map
Every domain your email depends on
Find lookalikes
Names registered to look like yours

Write records
Tick who sends as you, get the records
Route to Refused
Safe, tested steps to refuse forged mail
Try a change
Preview an edit before you publish
Check DNS changes
See who has your new record yet

Trace an email
Paste headers to see a message's route
Read DMARC reports
Provider XML reports, made readable

Check a fleet
Up to 25 domains in one table, worst first
Compare
Up to 4 domains side by side
Badges and API
README badge, JSON and a CI check

Find risks

DNS lookup
Every record for a domain, blocklists for an IP
Trust map
Every domain your email depends on
Find lookalikes
Names registered to look like yours

Fix records

Write records
Tick who sends as you, get the records
Route to Refused
Safe, tested steps to refuse forged mail
Try a change
Preview an edit before you publish
Check DNS changes
See who has your new record yet

Read your mail

Trace an email
Paste headers to see a message's route
Read DMARC reports
Provider XML reports, made readable

Many domains

Check a fleet
Up to 25 domains in one table, worst first
Compare
Up to 4 domains side by side
Badges and API
README badge, JSON and a CI check

Whose mail is safest?

Up to four domains side by side, check by check.

Try an exampleStripe against PayPal and Adyen GitHub against GitLab and Bitbucket stripe.com against neverssl.com

Reading DNS for one domain, live.

	Checking americanexpress.com Reading DNS, live	Open slot One domain has nothing to be compared with. Add another.
SPFWhich servers may send	americanexpress.com
DKIMSignatures on each message	americanexpress.com
DMARCWhat happens to forgeries	americanexpress.com
Mail serversWhere replies are delivered	americanexpress.com
MTA-STSForces TLS for inbound mail	americanexpress.com
TLS-RPTReports on failed TLS	americanexpress.com
BIMIBrand logo in the inbox	americanexpress.com
BlocklistsSpamhaus, SpamCop, Barracuda, PSBL	americanexpress.com
Forged mailWhat the records ask receivers to do	americanexpress.com
Domains it trustsLapsed ones can be bought	americanexpress.com
Allowed addressesListed as able to pass SPF	americanexpress.com
ProblemsCritical, high and medium	americanexpress.com

Each column is a live check, cached ten minutes. Open a domain for its records and fixes.