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"syntax error" from MS Exchange 5.5 + Spamfilter ISP

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drud View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote drud Quote  Post ReplyReply Direct Link To This Post Topic: "syntax error" from MS Exchange 5.5 + Spamfilter ISP
    Posted: 12 September 2003 at 1:25pm

Hello,

Ocasionally, I am getting external email users delivery attempts to our Internal MS EXCH Server 5.5 SMTP  (which is filtered through Spamfilter ISP) who recieve a "server <name> responded with Syntax Error" email back. Curiously, I do not get an NDR from our exchange server. Does anybody have knowledge of EXCH 5.5 - SpamFilter ISP idiocyncrasies and what could cause this?

mucho TIA,

drud

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eric View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote eric Quote  Post ReplyReply Direct Link To This Post Posted: 14 September 2003 at 11:56am

i disabled the rdns ehlo lookup in the registry, which is exploitable anyway..

and this and almost all problems where gone... (exchange 5.5 sp4)

 

note : i disabled it at the exchange server.

my config : exchange 5.5 smtp socket 26 through services file

logsat on tcp 25, outbound exchange remains at tcp 25.

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LogSat View Drop Down
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Joined: 25 January 2005
Location: United States
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Post Options Post Options   Thanks (0) Thanks(0)   Quote LogSat Quote  Post ReplyReply Direct Link To This Post Posted: 14 September 2003 at 11:11pm

If, using the error the external users receive, you can trace back the original email's date/time and from/to, you should be able to cross-reference the SpamFilter activity logs to try seing what has happened. SpamFilter logs all errors reported by the destination server (Exchange in your case). If you'd like to post the relevant section of the log we can try to help.

Roberto F.
LogSat Software

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Post Options Post Options   Thanks (0) Thanks(0)   Quote eric Quote  Post ReplyReply Direct Link To This Post Posted: 15 September 2003 at 6:01am

please note also that it is an exchange server and not a real smtp server,

 

exchange 5.5 is from a past time that ms$ thought they did not have to obey

the internet rfc...

so errormessages between exchange 5.5 and logsat are hard to track,

because of the b*llsh*t in the exchange smtp error logs.

 

 

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drud View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote drud Quote  Post ReplyReply Direct Link To This Post Posted: 15 September 2003 at 5:15pm

Thanks all -

09/11/03 12:34:46:364 -- (2816) Resolving <remote ip> - <remote domain>
09/11/03 12:34:46:364 -- (2816) Mail from:<remote user>
09/11/03 12:34:56:098 -- (2816) - MAPS search done... .
09/11/03 12:34:56:098 -- (2816) RCPT TO: <exchange user> accepted
09/11/03 12:34:56:801 -- (2816) EMail from <remote user> to <exchange user> was queued. Size: 50 KB
09/11/03 12:34:56:833 -- (856) Sending email from <remote user> to <exchange user>
09/11/03 12:34:56:911 -- (2816) Disconnect
09/11/03 12:34:56:958 -- (856) EMail from: <remote user> to: <exchange user> was returned to sender - server error - <internal-ip> said: Syntax Error
09/11/03 12:34:57:114 -- (856) Error-email from <remote user>t o <exchange user> was forwarded to <internal-ip>
09/11/03 12:34:57:114 -- (856) server error - <internal-ip> said: Syntax Error

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