55007 - 55008 dovecot
dovecot
You can connect with a dovecot server using the telnet protocol.
Basic commands
# Enter the username to login
USER username
# Enter password
PASS secretword
# Now, you are logged in and you can list message on the server for that user
LIST
# And you can read them using their id (id is a number=
RETR id
# You might be able to delete them
DELE id