How to Set up MTA-STS

Here is how to set up MTA-STS, step by step.

The steps

Publish an MTA-STS DNS record and host a policy file over HTTPS to require encrypted delivery to your domain, then add TLS-RPT for reports.

Why it matters

Getting this right is part of landing in the inbox instead of spam. See the full deliverability checklist.

How Rainmail helps

Rainmail sends from your own domain on a dedicated, isolated IP with SPF, DKIM, DMARC, reverse-DNS and managed warm-up handled for you, plus an AI that watches your list health and deliverability — and it welcomes the senders Amazon SES, SendGrid and Mailchimp reject, from $8. Run the free 10-second checker or see plans.