What Are the Main Email Servers and Which Ports Do They Use?


The main email servers are SMTP (for sending email), IMAP, and POP3 (for receiving email), and they use specific ports to communicate securely over the internet. SMTP commonly uses ports 587 and 465, IMAP uses 993, and POP3 uses 995 for secure connections. Choosing the correct server type and port is essential to ensure reliable, secure email delivery and access across devices.

SMTP: The Outgoing Email Server

What Is SMTP?

SMTP (Simple Mail Transfer Protocol) is responsible for sending emails from your device or application to the recipient’s mail server. Every email you send—whether from Gmail, Outlook, or a website contact form—uses SMTP.

SMTP does not store emails. Its only job is to deliver them to the next server.

Common SMTP Ports

Port-587 (Recommended)

  • Uses STARTTLS encryption

  • Most widely supported

  • Ideal for modern email clients and applications

Port-465

  • Uses SSL encryption

  • Often labeled as “Secure SMTP.”

  • Still commonly supported by major providers

Port-25

  • Original SMTP port

  • Frequently blocked by ISPs

  • Not recommended for regular use

Best Practice:
Use SMTP port 587 whenever possible for maximum compatibility and security.

Read More: Main Email Servers and Which Ports 

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