#port 587

Tagged: port 587

07 Jul 2026Sam wallness

SMTP Ports Explained: 25, 465, 587, and 2525 and When to Use Each

SMTP ports 25, 465, 587, and 2525 all do different things — and using the wrong one is a surprisingly common cause of email delivery failures. Here's exactly what each port is for and which one your setup should be using.

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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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