From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On Behalf Of abhishek singh Sent: Thursday, September 21, 2006 7:25 AM To: CentOS mailing list Subject: Re: [CentOS] sendmail security-with example i have solved one problem that was 1st example in my previous mail. means now no unknow user from my domain can send mail to my real users of mydomain but still there is 2nd problem means anyone can telnet to my server and can forge real domain address to sendmail to my domain users like telnet mail.domain.com 25 ............ ..... .... ............. Perhaps you should consider milter-sender if you want to verify that the sender is a valid email address. Mike