Re: [CentOS] sendmail security-with example

abhishek singh wrote:

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

Tell you what. Just ditch the whole sendmail thing and use postfix. If you are not using virtuser table, there should be very little, if not zero, changes.

http://www.postfix.org/ADDRESS_VERIFICATION_README.html

Postfix can do both with a few config lines natively. Just take note that some people do not appreciate callback verification.