---
type: link
tags: [public, hash]
created: 2025-11-06T02:51:46.190Z
updated: 2025-11-15T20:19:56.910Z
---# mta-sts

**URL:** [#](#)

mta-sts Mail Transfer Agent Strict Transport Security (MTA-STS) is an email security standard for secure delivery of email to your domain. With MTA-STS you let senders know that your email server accepts secure email delivery using SMTP over TLS (STARTTLS), and that email should not be delivered over an insecure SMTP connection.MTA-STS mitigates Man-In-The-Middle DNS and SMTP downgrade attacks that would allow an attacker to read or manipulate email in transit.


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**Keywords:** public, hash