Yes I am sure, I have tested this port from ping.eu and I got it is open.
config CSF inculudes:
# Allow incoming TCP ports
TCP_IN = "20,21,3031,25,53,80,110,143,443,465,587,993,995,2030,2031"
# Allow outgoing TCP ports
TCP_OUT = "20,21,3031,25,53,80,110,113,443,2030,2031,587,993,995"
and:
netstat -tulpn
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:4190 0.0.0.0:* LISTEN 13074/dovecot
tcp 0 0 0.0.0.0:993 0.0.0.0:* LISTEN 13074/dovecot
tcp 0 0 0.0.0.0:995 0.0.0.0:* LISTEN 13074/dovecot
tcp 0 0 127.0.0.1:10024 0.0.0.0:* LISTEN 23901/amavisd (mast
tcp 0 0 127.0.0.1:10025 0.0.0.0:* LISTEN 13177/master
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 22822/mysqld
tcp 0 0 0.0.0.0:587 0.0.0.0:* LISTEN 13177/master
tcp 0 0 127.0.0.1:3310 0.0.0.0:* LISTEN 13692/clamd
tcp 0 0 0.0.0.0:110 0.0.0.0:* LISTEN 13074/dovecot
tcp 0 0 0.0.0.0:143 0.0.0.0:* LISTEN 13074/dovecot
tcp 0 0 127.0.0.1:783 0.0.0.0:* LISTEN 23862/spamd.pid
tcp 0 0 0.0.0.0:465 0.0.0.0:* LISTEN 13177/master
tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN 1562/pure-ftpd (SER
tcp 0 0 185.4.29.16:53 0.0.0.0:* LISTEN 1263/named
tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN 1263/named
tcp 0 0 0.0.0.0:3031 0.0.0.0:* LISTEN 1392/sshd
tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 13177/master
tcp 0 0 127.0.0.1:953 0.0.0.0:* LISTEN 1263/named
tcp 0 0 127.0.0.1:8891 0.0.0.0:* LISTEN 13201/opendkim
tcp 0 0 :::2030 :::* LISTEN 12366/cwpsrvd
tcp 0 0 :::2031 :::* LISTEN 12366/cwpsrvd
tcp 0 0 :::80 :::* LISTEN 6303/httpd
tcp 0 0 :::21 :::* LISTEN 1562/pure-ftpd (SER
tcp 0 0 ::1:53 :::* LISTEN 1263/named
tcp 0 0 :::3031 :::* LISTEN 1392/sshd
tcp 0 0 ::1:953 :::* LISTEN 1263/named
udp 0 0 185.4.29.16:53 0.0.0.0:* 1263/named
udp 0 0 127.0.0.1:53 0.0.0.0:* 1263/named
udp 0 0 ::1:53 :::* 1263/named