> MTA-STS: A policy, published in DNS and on an HTTPS URL, that tells sending servers to deliver email to your domain only over an encrypted (TLS) connection…

Source: https://vaartix.com/glossary/mta-sts

[Email glossary](https://vaartix.com/glossary)

# MTA-STS

Also called: Mail Transfer Agent Strict Transport Security

A policy, published in DNS and on an HTTPS URL, that tells sending servers to deliver email to your domain only over an encrypted (TLS) connection with a valid certificate.

## How this affects you

MTA-STS protects email sent to your domain, so it's about your inbox, not about sending with Vaartix. Set it up with your inbox provider. Pair it with TLS-RPT so you hear about servers that couldn't connect securely.

## Learn more

-   [SPF, DKIM and DMARC explained](https://vaartix.com/docs/guides/spf-dkim-dmarc/)

Related: [TLS-RPT](https://vaartix.com/glossary/tls-rpt)

**Vaartix is a transactional email API built in India.** SPF, DKIM and a return path on your domain are set up for you, and every feature is free during the private beta.

[Request early access](https://vaartix.com/#early-access)