On Wed, 2006-09-20 at 05:12, abhishek singh wrote: > yes i am using SMTP Authentication , but when i m > doing telnet to my server on 25 port so i am able to > send mail by unknow user that in in not my mail server > like > > > mail from: <abs at domain.com> > > this command is showing Sender is ok while its not > user in my mail server.after that The stock Centos configuration should reject everything that doesn't come from the localhost unless you make changes to /etc/mail/access to permit it. Are you doing this test from the local host? -- Les Mikesell lesmikesell at gmail.com