Not receiving mail from gmail, yahoo and outside network emails

Im not receiving any emails from outside my own network like gmail yahoo, but i can send e-mails. When i checked error log i found the following error:

                                                          dovecot: imap(support@idsbangladesh.net.bd): Disconnected: Logged out bytes=13357/112222

Is there anything i can do to solve it? What can be the possible reason for this?