Can't receive mail

Hello,

Please i need help. I can't seem to be able to receive mail on the emails on my centos webpanel server. I can send mails out but cannot receive.

I checked my firewall port 25, 110,143 are among the listening ports associated with incoming and out going mails.

25/tcp     -/6  0     (8361/root)          /usr/libexec/postfix/master             /usr/libexec/postfix/master
110/tcp    -/6  0     (8260/root)          /usr/sbin/dovecot                       /usr/sbin/dovecot
143/tcp    -/6  5     (8260/root)          /usr/sbin/dovecot                       /usr/sbin/dovecot

This problem started when i removed sendmail as it was conflicting with the mail queue.

Please advice on how to resolve this. I've deleted and recreated the accounts still no incoming mails but i can send mails out with roundcube but i can't receive mails to any of my inboxes.

/var/log/maillog will tell you if email ever coming, otherwise check your dns for mx record