So, as we already suspected, neither SMTP or POP/IMAP is listening for incoming connections.
a.) Did this setup ever work? Or is this a new installation?
b.) Have you installed the SASL libraries, e.g.:
apt-get install libsasl2-2 libsasl2-modules libsasl2-modules-sql sasl2-bin libpam-mysql
c.) What happens (i.e., what is output to the terminal and what is appended to /var/log/mail.log
) when you attempt to start Dovecot, e.g.:
# service dovecot start
d.) Can you post the contents of the following two files? (Please be sure to wrap the output with code tags.)
Let's start there...