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MTA-STS

A comprehensive collection of questions and answers about MTA-STS email authentication from email marketers, experts and technical documentation.

What causes SSL/TLS key size errors in email SMTP transactions?

How to detect and verify MTA-STS policy changes and locations?

Why does Postfix show TLS handshake failure when connecting to an Exchange server?

Why is outbound TLS important for email marketing?

How does TLS inbound affect email deliverability and sender confidence?

Why is STARTTLS negotiation failing with the error 'connection died while negotiating STARTTLS TLS'?

What are the implications of disabling TLS 1.0/1.1 for outgoing email and what alternatives are available?

Why am I getting a Hotmail SSL error and how do I fix it?

What problems can occur when enabling HSTS without proper planning and communication with marketing teams?

What are MTA-STS reports and why am I getting them from Google?

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