What SMTP ports are available for the mail relay services?

The following SMTP ports available to void ISP blocking of the standard SMTP port and others. Those ports are:

  • 21
  • 25
  • 26
  • 88
  • 465 (SSL Only)
  • 1080 (SSL Only)
  • 2525
  • 8080
  • 8888 (SSL Only)

Please choose the port that best fits your requirements. Please also check your local firewall settings to make sure outgoing connections are allowed on the port you select.