Port outgoing mail

Port 25 is the default port used for sending outgoing mail (SMTP) in most email clients and servers. However, some internet service providers (ISPs) and organizations may block or restrict access to this port for various reasons, such as:

  1. Spam prevention: To prevent spamming, ISPs may block outgoing mail on port 25 to prevent malicious senders from using their networks.
  2. Security: Some organizations may block port 25 to prevent unauthorized access to their email systems.
  3. Compliance: Some ISPs may block port 25 to comply with anti-spam laws and regulations.

If you're experiencing issues sending outgoing mail, you may need to use an alternative port or configure your email client or server to use a different port. Here are some common alternatives:

  1. Port 587: This is a common alternative port used for sending outgoing mail. Many ISPs and email providers allow outgoing mail on this port.
  2. Port 2525: This port is often used for sending outgoing mail when port 25 is blocked.
  3. Port 587 TLS: This is a secure version of port 587, which uses Transport Layer Security (TLS) encryption.

To configure your email client or server to use a different port, you'll need to:

  1. Check your email client or server documentation for instructions on how to change the outgoing mail port.
  2. Contact your ISP or email provider to see if they have any specific requirements or restrictions for outgoing mail.
  3. Verify that the alternative port is not blocked by your ISP or organization.

Some common email clients and their default outgoing mail ports are:

Remember to always check with your ISP or email provider for specific requirements and restrictions on outgoing mail.