What is Hosted MTA-STS?
SMTP MTA-STS (Mail Transfer Agent Strict Transport Security) is an email security mechanism that notifies senders of your ability to receive emails over TLS secure SMTP connections. It also advises senders on whether or not to deliver the email if a TLS secure SMTP connection cannot be established.
Unlike SPF/DKIM and DMARC, MTA-STS policies are published on an HTTPS server that needs to be set up and maintained. Therefore, we offer Hosted MTA-STS services that can take care of that for you using a few clicks.