Disabling the use of TELNET:25 command for local users

[Sébastien N]

Hi,

I want to prevent local users to connect my smtp server on port 25 (via telnet for ex.) to avoid "anonymous mails" except for identified users (root, ...).
What is the better and simpliest way to do that ?

Thanx,
Sebastien.

[G. Vrijhoeven]

Sebastien,

check out:

http://www.wwdsi.com/demo/saint_tutorials/Sendmail_vulnerabilities.html

Gideon

[Niraj Kumar Verma]

Hi,

I have a suggesation.

you can use postfix, its very similar to the sendmail and
you can achive very good security.

visit

www.postfix.org

Regards
-Niraj

[Sébastien N]

I forgot to say that the SMTP server is not administrate by myself.

What I want to do is prevent specific users (but not all users) on server A to access port TCP/25 on server B without modifying server B.

Any ideas ?

[Niraj Kumar Verma]

Hi,

You can achive this by writing a WRAPPER to your telnet ....


-Niraj

[Sébastien N]

Hi,

What do you mean by "write a wrapper" ? Do you have an exemple ?
I tried tcp_wrapper, but it seems to work only on incoming connections :-(