How do I manually telnet to my POP (Post Office Protocol)
server to check if my mail server is accepting connections?
This method of manually connecting to the mail server is
sometimes necessary in order to help better troubleshoot Messaging/Mail
issues. By directly telneting to the POP server, you can determine
if the problem is within the client software or the server.
Following is a list of commands to be executed from the UNIX
command line or DOS shell using the telnet utility:
Telnetting to port 110 (the POP port).
telnet machine 110
USER uid Log in as "uid"
PASS password Substitue "password" for your actual password
STAT List number of messages, total mailbox size
LIST List messages and sizes
RETR n Show message n
DELE n Mark message n for deletion
RSET Undo any changes
QUIT Logout (expunges messages if no RSET)
TOP msg n Show first n lines of message number msg
More commands (and the entire spec) are available at http://www.imc.org/rfc1939