I wasn't receiving any e-mail via POP, even though I could see that my mailbox contained about 130 mails, via webmail. I tried to run /scripts/restartsrv_cppop, but I kept getting a message that it was waiting to bind to port 110, which was already in use. After a bit of netstat'ing, I discovered that xinetd (xinetd -stayalive -pidfile /var/run/xinetd.pid) was setup to LISTEN on there constantly, so I did a kill -9 on it and ran /scripts/restartsrv_cppop again, this time cppop starting fine. Now I can download my e-mail ok, but I was wondering whether xinetd needed to be running for any reason; it was listening on the pop3, pop3s and imap ports. If it doesn't need to be running and indeed prevents cppop from running, how did it manage to start running on my server?