github.com · Email
No MTA-STS
Servers sending you email may deliver it unencrypted if someone interferes with the connection.
- Publish a policy at https://mta-sts.github.com/.well-known/mta-sts.txt.
- Then add the record below, changing its id whenever the policy changes.
v=STSv1; id=1What it checks
An MTA-STS record, where the domain takes email.
Why it matters
It makes servers sending you email insist on encryption.