Utilities: Administration: Server: Server Settings: Network Settings: Ports
Incoming SMTP port
This setting defines the TCP/IP port ListManager listens on for incoming mail. By default, this setting uses port 25, the Internet standard for receiving SMTP mail.
In some situations, you may want to move the ListManager SMTP service to another port. For example, you may have antivirus gateway software listening on port 25. In such a case, you will need to configure your mail system so that the mail that ListManager should get is forwarded on to ListManager at its port. For instance, you might create an alias (a DNS CNAME) for ListManager mail, and inform your mail system that mail addressed to this alias should be passed on to ListManager on this port assignment.
Note: If you change this port number, and don't work out an alternate way for ListManager to get its mail, ListManager will no longer be able to receive mail, and any mail sent to it from the outside will not reach it.
Note: If no site is configured in ListManager, ListManager will listen to ALL IP addresses on port 25.
Newsgroup port
Specifies the port to be used by the newsgroup server built into ListManager. Most newsgroup browsers expect a news server to be on port 119, so you should only change this port if you understand the implications: all newsgroup browsers using your server will have to explicitly ask for the port you re-assign your server to.
DNS port
Specifies the port to be used by ListManager's DNS engine. By default, all DNS lookups will be performed on port 53, the Internet standard for DNS lookups.
In some situations, you may want to specify that ListManager use a different port for DNS lookups. That port number may be specified here.
TCLPORT port
Specifies the port used by the ListManager web server to communicate with ListManager. By default, it uses port 2021 as its port. Only change this port number if you have a TCP/IP port conflict with another service. This is also the port used by remote servers to connect and execute Tcl commands.
If you change the HTTP-LM port number, you will also need to change the server port setting in the ListManager Web Interface's tclhttpd.rc file.
TCLPORT password
(required) The password that you want the ListManager Command Protocol to use. The server uses port 2021 to communicate with the web interface and with other programs. Access to the Command Protocol is password protected, so that outsiders cannot affect your server. The default password is "TCLPORTPasswd". You may want to change this password to give you a greater level of security.
However, if you do change this password, immediately after changing it the web interface will no longer work. This is because the web interface configuration file tclhttpd.rc will still have the old password, and will no longer be able to access the Command Protocol of your ListManager. So, immediately after making a change to the Tclport Password and saving the change, you will need to edit the tclhttpd.rc file that is found in your ListManager/tclweb/lib directory. You will want to change the line Config tclport_password {TCLPORTPasswd} to reflect the new password that you have set.
NOTE If you do not change your Tclport Password, you are still well protected by the Tclport Hosts setting available at Utilities: Administration: Server: Server Settings: Security: GUI Hosts.
NOTE The Tclport password is not encrypted, as it is in tclhttpd.rc in plain-text.
More
1. Server Settings: Network Settings: Receive Email
2. Server Settings: Network Settings: Deliver Email
3. Server Settings: Network Settings: Relay Hosts
4. Server Settings: Network Settings: Ports
5. Server Settings: Network Settings: DNS