You want them to be able to use Thunderbird, et al. but not telnet directly to port 25? Impossible afaik. Why would you want to stop that? Rob Marti ________________________________________ From: redhat-list-bounces@xxxxxxxxxx [redhat-list-bounces@xxxxxxxxxx] On Behalf Of Raj Har [raj4list@xxxxxxxxx] Sent: Tuesday, June 30, 2009 02:14 To: redhat-list@xxxxxxxxxx Subject: Mail server Hello experts, I have configured my mail server (postfix) in intranet. user can send mail from one user to another user via client s/w like Thunderbird. but user can send mail from telnet utility eg. #telnet server ip 25 they can send mail from this system. i wanna stop this utility and i wanna send some error message to client ..... but my mail server should be run properly. can i do this??? Thanks. -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list