----- Original Message -----
From: "Masoumeh Izadi" <iz...@iranet.ir>
To: <postfix-users@postfix.org>
Sent: Wednesday, May 30, 2012 1:14 PM
Subject: Telnet not authenticating
Hi;
We have a postfix Email server . when someone telnet to port 25 on our
server, it is possible to send email from any ID user1@ anydomain to any
user2@ mydomain
telnet x.x.x.x 25
ehlo localhost
mail from:user@anydomain
sender OK
rcpt to: user@mydomain
recipient OK
The question is that: Is there any solution to prevent this matter or
somehow make postfix to authenticate the users telneting the server
directly?
By the way, our email server is not an open relay server.
Thanks
Well one thing you could do is to put your internal domains in a
sender_access map and make them auth enabled only and add the the changes to
your smtpd_sender_restriction in main.conf.
Postfix internal functions such as error notification among other things
doesn't seem to be interrupted by setting this.
