MTA-STS Configuration

Mail Transfer Agent Strict Transport Security

Policy Configuration
Current MTA-STS settings
Mode enforce
Max Age 86400 seconds
MX Records
*.mail.protection.outlook.com
Required DNS Record
TXT record for _mta-sts subdomain
_mta-sts TXT "v=STSv1; id="
Optional Reporting Record
TXT record for _smtp._tls subdomain
_smtp._tls TXT "v=TLSRPTv1; rua=mailto:mta-sts@"
View Policy File