Re: Setup SMTP Filter

Are those commands actually "XXXX"?
If so, those aren't valid SMTP verbs and you then have two choices:
1. run your favorite packet tracer on the ISA external IP and watch for this
event to fire.
    You can then watch the conversation up to that point to see what's going
on.
2. contact the owners of those servers and ask them why they're sending this
to you
If not, what are they?

 Jim Harrison
 MCP(NT4, W2K), A+, Network+, PCG
 http://www.microsoft.com/isaserver
 http://isaserver.org/Jim_Harrison
 http://isatools.org

 Read the help, books and articles!
----- Original Message ----- 
From: "William Robertson" <robertson.william@xxxxxxxxxxxxxx>
To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
Sent: Tuesday, June 03, 2003 07:20
Subject: [isalist] Re: Setup SMTP Filter


http://www.ISAserver.org


Hi Jim

After enabling the SMTP Filter and setting the NOOP length to 20 bytes,
I then started getting the following alerts from my Firewall:

ISA Server alert: An unknown SMTP command
XXXX ASTPROXY01.AST.CO.ZA
XXXX TCEN-UL-MAILSV01.TELKOM.CO.ZA
XXXX SMTP.LANTIC.NET
XXXX NS2.DHV.NL
XXXX MFCS002.SAMANCORCR.CO.ZA
XXXX JS000414.JOBSERVE.COM
XXXX AVEROMAR01.POVOAHOLDINGS.COM
etc
etc
etc

Do you perhaps know where I may start trying to figure out what exactly
these commands are that I need to enable? (BTW, I have a linux-based
sendmail server - no fancy schmancy exchange servers for me :(

Thanks
William R.

-----Original Message-----
From: Jim Harrison [mailto:jim@xxxxxxxxxxxx]
Sent: 02 June 2003 16:41 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] Re: Setup SMTP Filter

http://www.ISAserver.org


Generally, 20 is seen as a good upper limit for NOOP.
AUTH should be 1024, if you enable it.
Don't expect to screen HTML mail; the screener doesn't seem to like
them.

 Jim Harrison
 MCP(NT4, W2K), A+, Network+, PCG
 http://www.microsoft.com/isaserver
 http://isaserver.org/Jim_Harrison
 http://isatools.org

 Read the help, books and articles!
----- Original Message ----- 
From: "William Robertson" <robertson.william@xxxxxxxxxxxxxx>
To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
Sent: Monday, June 02, 2003 01:03
Subject: [isalist] Setup SMTP Filter


http://www.ISAserver.org


Hi there



My original installation of ISA Server excluded the setup of the SMTP
filter as I appeared to have problems with receiving mail etc. I have
now got some time on my hands ( yeah right.!) and would like to start
playing with it again.



I would like to know of any "out-the-box" tricks that I need to use to
get it working properly. I know for one thing that the default NOOP
value of 6 is apparently too small. Could someone please let me know
what a more acceptable NOOP setting is, as well as any other
variables/settings that I need to customise, or be on the lookout for.
Any reference to reading material to assist with the comprehension of
this topic would be a great asset.



Cheers

William R.



  _____


William Robertson

AST Mpumalanga


Systems House / Consultant: Software


Tel: 013-2472703 / 083 638 0354

   Fax: 013-2462236




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Stainless does not own and endorse any other content. Views and
opinions are those of the sender unless clearly stated as being that
of Columbus Stainless. The person addressed in the e-mail is the sole
authorised recipient.  Please notify the sender immediately if it has
unintentionally reached you and do not read, disclose or use the
content in any way. Whilst all reasonable steps are taken to ensure
the accuracy and integrity of information and data transmitted
electronically and to preserve the confidentiality thereof, no
liability or responsibility whatsoever is accepted if information or
data is,for whatever reason, corrupted or does not reach its intended
destination.
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