Depending on your setup, you will likely choose between four main ports: 25, 465, 587, or 2525. 1. Port 587 (The Modern Standard)
Using 587 or 465 ensures your login credentials and email content are encrypted, protecting them from "man-in-the-middle" attacks. smtp port
Generally associated with Port 587. It is the modern, more secure successor to SSL. Depending on your setup, you will likely choose
Port 587 is the primary port for email submission today. It supports STARTTLS encryption, meaning that even if the connection starts as plain text, it will be upgraded to a secure, encrypted connection. Most email service providers (like Gmail, Outlook, and SendGrid) recommend 587 as the default. 2. Port 465 (The Legacy Secure Port) Generally associated with Port 587
Here is everything you need to know about SMTP ports, which one to use, and why they matter. What is an SMTP Port?