You cannot do this.  I looked into this myself.  They have to remain open
that way for Exchange email to work.

It's a RFC.

Phil

-----Original Message-----
From: James Barr [mailto:[EMAIL PROTECTED]] 
Sent: October 22, 2001 13:58
To: Exchange Discussions
Subject: Disabling telnet sessions to ports 25, 110...

Hello,

How do I disable a telnet session to ports 25 and 110 (i.e., get
"Connection Refused"  when attempting this) on my Exchange 5.5, SP4 box?
The machine is running NT 4.0, SP6. Some companies do this purposely,
others leave it open. Obviously, I don't want to stop mail from coming in
to the org, but I would prefer not to allow telnet sessions to the box
itself. Currently, my exchange server has relaying prohibited for POP3
users. The firewall in front only allows ports 25, 110, and 443 (for
secure OWA) in to the server.

Please advise,

Jim Barr

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