On 04/06/2012 03:28 PM, Rafiqul Islam wrote:
My question is too many unknown user sending mail using my MTA(Postfix) so that hotmail,google reject mail from my domain(mail.navigation.com http://mail.navigation.com and IP:202.53.168.75) and i don't know how to stop this unexpected outgoing mail.
You may want to use an online tool to check your server....
http://www.mxtoolbox.com/diagnostic.aspx
http://www.mailradar.com/openrelay/
are two....