Re: [CentOS] sendmail security-with example

Mahayudin Mohd Hashim wrote:

abhishek singh wrote:

...

i have never opened telnet ok , my xinetd service is off so there is no telnet service , i m doing telnet to outside to 25 port on my mail server and there is proper smtp authentication enabled on server , the problem is anyuser (non-existing) with my domain can send mail to my real domain users. below is example........

Check this and do accordingly ...

http://www.sendmail.org/faq/section3.html#3.27 http://www.sendmail.org/tips/relaying.html

hope this help!

It does not. He does not have a relay problem. He wants to reject mails that have sender addresses claiming to be from his domain and not only that, they are also forged (non-existent).