[CentOS] sendmail security-with example

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!

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