Thanks for the feedback.
But the problem is anybody can compose a mail, via telneting to port 25.
and then impersonatting the person can send a mail on his behalf. Can i
enable any sort or authorisation on the pix firewall or is there a setting
in the Lotus Notes server R5.
Regards
Navin Mehra
Softcell Technologies
Ph. 460 6969 Extn. 220
"Madhur
Nanda" To: "Navin Mehra/MUM/IN/STTL"
<MadhurN@infy <[EMAIL PROTECTED]>,
.com> <[EMAIL PROTECTED]>
cc:
03/25/2002 Subject: RE: Restrict telnet to port 25
via
01:46 PM firewall.
If this is your mail gateway and this you are using for sendig and
recieving mails over the internet then you cannot restrict access to port
25 as this is required for its purpose. One way is to put some filtering
mailing gatway that will restrict any smtp spoofing. i.e. this gateway will
not accept messages from external network with source e-mail id containing
your mail domain suffix. Also you can restrict SMTP relay.
i hope this help
rgds
Madhur
-----Original Message-----
From: Navin Mehra/MUM/IN/STTL [mailto:[EMAIL PROTECTED]]
Sent: Monday, March 25, 2002 10:26 AM
To: [EMAIL PROTECTED]
Subject: Restrict telnet to port 25 via firewall.
Hi,
I have a Lotus Notes mail server behind my Pix firewall 5.3(1), the problem
is anyone from outside is able to telnet my smtp port 25 and compose a mail
and send it. The issue is though my mail server restricts free relay he/she
can compose a mail via telnet to port 25 in name of anyone else in the same
domain and send a false mail on his behalf.
So is there anyway where by I can block the telnet to port 25 and thereby
stop the composition of a mail. Is there a way to authorise/restrict access
the telnet to service ports.
Requesting assistance
Regards
Navin Mehra
Softcell Technologies
Ph. 460 6969 Extn. 220
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