hi
try to use http://mxtoolbox.com/blacklists.aspx to see if you ip or domain name is block if you need to get is unblock
are you using port 25 as SMTP if it can be block
if change the port use on of the guide on the forum to change
hint look after postfix/master.cnf
and submission inet n - n - - smtpd
it is port 587
try to use http://mxtoolbox.com/blacklists.aspx to see if you ip or domain name is block if you need to get is unblock
are you using port 25 as SMTP if it can be block
if change the port use on of the guide on the forum to change
hint look after postfix/master.cnf
and submission inet n - n - - smtpd
it is port 587