After setting up ISPConfig and getting the inbound mail functional, I find myself wondering how to configure a POP3 client to pull it off the server. The default uid format is web[WEBID]_username. I have yet to find the answer to how an email client like Outlook or Eudora is configured to retrieve mail. Help please, and thanks.
The username is web[WEBID]_username. As SMTP/POP3 server you can specify any FQDN or IP address pointing to your server. Make sure that you enable "Server requires authentication." because otherwise you'll get a "Relay access denied" error when you try to send mails.