Please login to squirrelmail, then send an email from within squirrelmail to the same address that you used for the login and check after a minute if the mail is in your inbox. If not, post the lines that got added to the mail.log file.
current mail.error log: Unable to read /var/log/mail.err current mail.log: Apr 10 19:55:01 server1 postfix/smtpd[6964]: connect from localhost[::1] Apr 10 19:55:01 server1 postfix/smtpd[6964]: lost connection after CONNECT from localhost[::1] Apr 10 19:55:01 server1 postfix/smtpd[6964]: disconnect from localhost[::1] Apr 10 19:55:01 server1 dovecot: pop3-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=::1, lip=::1, secured, session=<zgehdmITwwAAAAAAAAAAAAAAAAAAAAAB> Apr 10 20:00:01 server1 dovecot: imap-login: Disconnected (disconnected before auth was ready, waited 0 secs): user=<>, rip=::1, lip=::1, secured, session=<p5N+iGITXQAAAAAAAAAAAAAAAAAAAAAB> Apr 10 20:00:01 server1 postfix/smtpd[7096]: connect from localhost[::1] Apr 10 20:00:01 server1 postfix/smtpd[7096]: lost connection after CONNECT from localhost[::1] Apr 10 20:00:01 server1 postfix/smtpd[7096]: disconnect from localhost[::1] Apr 10 20:00:01 server1 dovecot: pop3-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=::1, lip=::1, secured, session=<6aR+iGITOQAAAAAAAAAAAAAAAAAAAAAB> Apr 10 20:00:36 server1 dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=::1, lip=::1, mpid=7159, secured, session=<ihaZimITfAAAAAAAAAAAAAAAAAAAAAAB> Apr 10 20:00:36 server1 dovecot: imap([email protected]): Disconnected: Logged out in=79 out=777 Apr 10 20:05:02 server1 dovecot: imap-login: Disconnected (disconnected before auth was ready, waited 0 secs): user=<>, rip=::1, lip=::1, secured, session=<W5RsmmIT3wAAAAAAAAAAAAAAAAAAAAAB> Apr 10 20:05:02 server1 postfix/smtpd[7266]: connect from localhost[::1] Apr 10 20:05:02 server1 postfix/smtpd[7266]: lost connection after CONNECT from localhost[::1] Apr 10 20:05:02 server1 postfix/smtpd[7266]: disconnect from localhost[::1] Apr 10 20:05:02 server1 dovecot: pop3-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=::1, lip=::1, secured, session=<Q6VsmmITuwAAAAAAAAAAAAAAAAAAAAAB> Apr 10 20:10:01 server1 dovecot: imap-login: Disconnected (disconnected before auth was ready, waited 0 secs): user=<>, rip=::1, lip=::1, secured, session=<YAVLrGITLQAAAAAAAAAAAAAAAAAAAAAB> Apr 10 20:10:01 server1 dovecot: pop3-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=::1, lip=::1, secured, session=<OghLrGITCQAAAAAAAAAAAAAAAAAAAAAB> Apr 10 20:10:01 server1 postfix/smtpd[7409]: connect from localhost[::1] Apr 10 20:10:01 server1 postfix/smtpd[7409]: lost connection after CONNECT from localhost[::1] Apr 10 20:10:01 server1 postfix/smtpd[7409]: disconnect from localhost[::1] Apr 10 20:15:01 server1 dovecot: imap-login: Disconnected (disconnected before auth was ready, waited 0 secs): user=<>, rip=::1, lip=::1, secured, session=<92suvmITlwAAAAAAAAAAAAAAAAAAAAAB> Apr 10 20:15:01 server1 postfix/smtpd[7604]: connect from localhost[::1] Apr 10 20:15:01 server1 postfix/smtpd[7604]: lost connection after CONNECT from localhost[::1] Apr 10 20:15:01 server1 postfix/smtpd[7604]: disconnect from localhost[::1] Apr 10 20:15:01 server1 dovecot: pop3-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=::1, lip=::1, secured, session=<in0uvmITKgAAAAAAAAAAAAAAAAAAAAAB> Apr 10 20:20:01 server1 dovecot: imap-login: Disconnected (disconnected before auth was ready, waited 0 secs): user=<>, rip=::1, lip=::1, secured, session=<vrQO0GIT4gAAAAAAAAAAAAAAAAAAAAAB>