Mail Server Monitor
The Mail Server monitor can watch a POP3, IMAP4 and/or SMTP mail server on a monitored computer to ensure they are up and running.
Above you can see the configuration dialog that lets you the mail server configuration. When specifying a mail server, you give the server name or IP address, the mail server type and if POP3 or IMAP, a username and password to login with to test connectivity. When the server type is selected, the standard port is entered for you, but you can also change it for non-standard configurations.