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Ports and Protocols

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Updated information at: Classic Linux ports and protocols.

Also please see:

(Note: This page is for classic_linux_old. If you are directadmin user, we have a different page for you with the same name: ports_and_protocols.)

(Update. 2009-10-13 6:13 pm. Stage 1 is now in effect. Please make the changes described below.)

In the classic_linux_old environment, after Stage 1 of our mail system migration comes into effect, our new servers will no longer use pop-before-smtp to identify you as a customer when you send outgoing mail. You will therefore need to configure your POP or IMAP client to send mail using authenticated SMTP on port 587.

(Please don't make this change before Stage 1 comes into effect, as authenticated SMTP won't work until then.)

All the available ports and protocols are given below.

For reading mail after Stage 1 comes into effect:


  • Connect to
  • Use either insecure IMAP, or secure IMAP with TLS, on port 143.
  • Or use secure IMAP with SSL on port 993.


  • Connect to
  • Use either insecure POP, or secure POP with TLS, on port 110.
  • Or use secure POP with SSL on port 995.

For sending mail after Stage 1 comes into effect:

  • Connect to
  • Use either insecure authenticated SMTP on port 587.
  • Or use secure authenticated SMTP with TLS on port 587.
  • Or use secure authenticated SMTP with SSL on port 465.

Note: If you have a DSL, cable, or other high-speed connection, you can send outgoing mail via your connectivity provider's SMTP server following their instructions. It's not necessary for you to connect to to send outgoing mail.

Note: For authenticated SMTP, please use your login name and password as you would use it to log in via ssh into the Linux shell, i.e., of the form “joeuser” (and not of the form

Old Servers

Our old servers and will continue to operate for a limited time. If using authenticated SMTP proves to be a hardship for you, you can simply repoint your POP or IMAP client to these older machines, and keep using the old ports and protocols so long as the old servers are available. If you wish to do this, then instead of connecting to or, connect to or Each machine will do both POP and IMAP. All other information will then remain unchanged, and you will connect to SMTP port 2525 on these machines to send outgoing mail.

Note that if either of the two machines is not available, you will need to manually repoint your mail client to the other.

old/classic/ports_and_protocols.txt · Last modified: 2021/01/30 02:36 by admin