I know this wouldn't be easy, but what if you wrote a proxy server for port 25. That proxy server would look to see if it was receiving one character at a time (implying telnet) or one line at a time (implying another SMTP server).
Telnet is character at a time by definition and I've never seen a SMTP server that sent one character at a time, it always sends a line, at least the initial HELO line in one shot. Thoughts? -Walden -----Original Message----- From: Don Ely [mailto:[EMAIL PROTECTED]] Sent: Monday, October 22, 2001 7:17 PM To: Exchange Discussions Subject: RE: Disabling telnet sessions to ports 25, 110... And here I thought this was common knowledge... Again, I have been proven wrong. ;o) -----Original Message----- From: Phil Labonte [mailto:[EMAIL PROTECTED]] Sent: Monday, October 22, 2001 12:40 PM To: Exchange Discussions Subject: RE: Disabling telnet sessions to ports 25, 110... 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 _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Archives: http://www.swynk.com/sitesearch/search.asp To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Archives: http://www.swynk.com/sitesearch/search.asp To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Archives: http://www.swynk.com/sitesearch/search.asp To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Archives: http://www.swynk.com/sitesearch/search.asp To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED]
