#STARTTLS

Tagged: STARTTLS

13 Jun 2026Sam wallness

MTA-STS and TLS-RPT: Enforcing Encrypted Email Delivery

MTA-STS and TLS-RPT protect email in transit by requiring encrypted SMTP connections to your domain and reporting TLS failures. Learn how to implement both standards safely without disrupting delivery.

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SMTP Ports Explained: 25, 465, 587, and 2525

SMTP & Infrastructure

13 Jun 2026Sam wallness

SMTP Ports Explained: 25, 465, 587, and 2525

Choosing the wrong SMTP port can mean unencrypted connections, silent ISP blocks, or refused submissions. This guide explains ports 25, 465, 587, and 2525—what each does and when to use it.

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