pop3 works now, since telnet ip_addr 110 worked, but pop3 connection failed, I found I need to user user_name only instead of
user_name@domainname.com
Howvere, there were only 3 posts got pushed, nope for additional, why?
Feb 9 11:33:02 * dovecot: pop3-login: Login: user=<*>, method=PLAIN, rip=*, lip=*, mpid=21118, secured
Feb 9 11:40:01 * dovecot: pop3-login: Login: user=<*>, method=PLAIN, rip=*, lip=*, mpid=23110, secured