You can use a proprietary email server that rely on RPC connections, and force smtp authentication (ex. Exchange).
This will provide you with the results I think you need. Romulo M. Cholewa http://www.rmc.eti.br PGP Keys Available @ website. � "If a technology does not seem like magic, that's � � because it's not good enough." � ����������������������������������������������������������� ����������������������������������������������������������� |-----Original Message----- |From: [EMAIL PROTECTED] |[mailto:[EMAIL PROTECTED]] On Behalf Of |[EMAIL PROTECTED] |Sent: Wednesday, April 24, 2002 2:32 AM |To: Clifford Thurber |Cc: Binaya D. Joshi; [EMAIL PROTECTED]; Chris Lee |Subject: Re: blocking telnet to port 25 | | | | |could you fingerprint the source port? | |-C | |=-=-=-=-=-=-=-=-=-=-=-=-= | |0100111001101111011100110110010101111001 |Christopher Regenye | |System Services | I know you believe you understand what you |PR Newswire | think I said, but I am not sure you realize that |christopher_regenye | what you heard is not what I meant. | @prnewswire.com | |=-=-=-=-=-=-=-=-=-=-=-=-= | |0111010000100000010110010110111101110101 | | | | | ||--------+----------------------------> || | Clifford Thurber | || | <cthurber@edisonsc| || | hools.com> | || | | || | 04/10/02 10:56 AM | || | | ||--------+----------------------------> | |>-------------------------------------------------------------- |----------------| | | | | | | To: "Binaya D. Joshi" <[EMAIL PROTECTED]>, Chris |Lee | | | <[EMAIL PROTECTED]> | | | | cc: [EMAIL PROTECTED], (bcc: Christopher |Regenye/PR Newswire)| | | Subject: Re: blocking telnet to port 25 | | | |>-------------------------------------------------------------- |----------------| | | | | | |You can't block telnet to port 25 you can either block port 25 |or port 23 but thats it. SMTP is a mail protocol it does not |care how the connection to the IP/port pair was established as |long as it follows the SMTP protocol(i.e issues Helo, Mail |From: Rcpt To: etc.) | | |At 04:14 PM 4/10/2002 +0545, Binaya D. Joshi wrote: |>blocking telnet to port 25 in mail server... huh ??? |> |> if so; may be this be the last mail u r be receiving :) |> |> |> |>B.D.Joshi |> |> |>On Wed, 10 Apr 2002, Chris Lee wrote: |> |> > If you want mail to through, you can't. |> > |> > Chris |> > |> > Sayed Peerzade wrote: |> > |> > > Hello, |> > > |> > > I'm systems engineer in an ISP handling mail servers, i also |> > > handle checkpoint. pls tell me how to block telnet to port 25, |> > > keeping normal telnet to perform normally on mail server |(netscape |> > > messaging server running on solaris OS)) |> > > u can tell me method to block either in checkpoint or on |mail server |> > > itself. |> > > Thanks and regards. |> > > |> > > Sayed K.Peerzade. |> > > |> > > _______________________________________________ |> > > Firewalls mailing list |> > > [EMAIL PROTECTED] |> > > http://lists.gnac.net/mailman/listinfo/firewalls |> > |> > _______________________________________________ |> > Firewalls mailing list |> > [EMAIL PROTECTED] |> > http://lists.gnac.net/mailman/listinfo/firewalls |> > |> |>_______________________________________________ |>Firewalls mailing list |>[EMAIL PROTECTED] |>http://lists.gnac.net/mailman/listinfo/firewalls | |_______________________________________________ |Firewalls mailing list |[EMAIL PROTECTED] |For Account Management (unsubscribe, get/change password, etc) |Please go to: http://lists.gnac.net/mailman/listinfo/firewalls | | | |_______________________________________________ |Firewalls mailing list |[EMAIL PROTECTED] |For Account Management (unsubscribe, get/change password, etc) |Please go to: http://lists.gnac.net/mailman/listinfo/firewalls | _______________________________________________ Firewalls mailing list [EMAIL PROTECTED] For Account Management (unsubscribe, get/change password, etc) Please go to: http://lists.gnac.net/mailman/listinfo/firewalls
