Re: Block port 25

by default ISA denies all outbound traffic, so if your clients have acces to
port 25 outbound, then this is happening because of some rule that permits
that. Remove SMTP from that rule and set up a separate rule for SMTP that
will apply only to the Exchange server.


--
Regards,
Andrei Ungureanu
www.eventid.net
Test our new EventReader beta!
http://www.altairtech.ca/eventreader/default2.asp?ref=au

"José Dávalos Palma" <jdavalos@xxxxxxxxxx> wrote in message
news:%23%23NJG0EHGHA.2696@xxxxxxxxxxxxxxxxxxxxxxx
> Please:
>
> Could anyone tell me how to block the port 25? What I need is to avoid my
> network clients to send SMTP traffic outbound, excepting my Exchange
> server.
>
> I have ISA Server 2000, and it publishes my Exchange Server.
>
> Thanks a lot.
>
> Jose
>
>


.

Relevant Pages

  • Re: published mail server behind 2006 cannot telnet out on port 25?
    ... I tried creating an outbound access rule (port 25 of internal ... From the outside, POP3 works, and SMTP can be used to send an email to ... But, the Exchange Server cannot send emails to the outside world, they ...
    (microsoft.public.isa)
  • TCP Port 1169
    ... Has anyone noticed any of your clients talking to an exchange server on port ... I have noticed that in my environment that some clients are talking to ...
    (microsoft.public.exchange2000.protocols)
  • Re: [fw-wiz] Exchange & Blackberry
    ... it's an outbound TCP connection on one port (3101 I ... Border MTA on the DMZ with only port 25 inbound from the world, ... outbound to the world and port 25 to/from the internal Exchange server. ...
    (Firewall-Wizards)
  • Re: TCP Port 1169
    ... > associated with a port. ... > Image Name PID Session Name Session# Mem Usage ... > Has anyone noticed any of your clients talking to an exchange server on ... I have noticed that in my environment that some clients are talking ...
    (microsoft.public.exchange2000.protocols)
  • Re: stop spamming
    ... They should show any outbound ... port 25 traffic, and what the originating IP is... ... >> engine, so it may not be going through your exchange server, but may be ... >>> It seems that originating IP is mine. ...
    (microsoft.public.exchange.admin)