Commonly Used SMTP Ports and Their Purposes

SMTP (Simple Mail Transfer Protocol) is a widely used protocol for sending email messages over the internet. There are several commonly used ports for SMTP, each serving a specific purpose:

• Port 25: This is the default port for sending emails. It is used for communication between email servers to send outgoing mail.
• Port 587: Also known as the submission port, Port 587 is used for email client authentication when sending mails through a secure connection. It is often used for sending emails from a client to a server.
• Port 465: Port 465 is used for SMTP over SSL (Secure Sockets Layer) or SMTPS. It provides a secure encrypted communication channel for sending emails.
• Port 2525: Some email providers use Port 2525 as an alternative port for SMTP communication in case the default Port 25 is blocked by ISPs or network administrators.

Understanding these commonly used SMTP ports and their purposes is essential for configuring email servers and ensuring the smooth delivery of email messages.