Some email gets lost in the "where did it go zone"

holidayinnexpress
holidayinnexpress used Ask the Experts™
on
We have a few companies that are trying to send us mail and it doesn't go through.  This started last friday.  Our environment is Firewall--> Esafe spam filter --> exchange.  We can see the mail go through the firewall, but don't see it in the esafe logs.  I put a sniffer on the back of the firewall and this is what it looks like:

220  xxx.com eSafe SMTP Service ready 27-Jan-2010 15:02:54

EHLO mail1.yyy.com

500 Syntax error, I cannot recognize this command

HELO mail1.yyy.com

250  Requested mail action okay, completed

MAIL FROM:<prvs=63620ec5d=john.doe@yyy.com>

250  Requested mail action okay, completed

RCPT TO:<jane.doe@xxx.com>

250  Requested mail action okay, completed

DATA

354 Start mail input; end with <CRLF>.<CRLF>


this is only happening for a handful of companies.  All other mail is working fine.  

We have been looking for the needle, but have run out of hay.  and we are by no means email experts, hence the question..

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Alan HardistyCo-Owner
Top Expert 2011

Commented:
What make / model is your firewall?

Is it on the latest firmware?

If it is a Cisco box, have you disabled SMTP fixup?

Author

Commented:
checkpoint, yes
Co-Owner
Top Expert 2011
Commented:
I believe the checkpoint's have a bug in their code that can cause problems and you would be best advised to talk to them to resolve the issue.

Not sure if you are affected, but I would imagine from other EE questions I have worked on personally, that this would be the best place to start focusing your efforts.

Not what you were probably looking for in terms of a solution, but currently my best advice.
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Author

Commented:
It was the firewall....
Alan HardistyCo-Owner
Top Expert 2011
Commented:
Well I suppose that is good news.  Hope Checkpoint fix it soon.

Don't forget to close the question down if you have finished with it.

Alan

Author

Commented:
I posted that response to soon.  We have narrowed the issue down to the ISP.  The temporary router / firewall I built was blocking the traffice.  We moved the temp router to a DSL circuit, and everything worked like a champ.  I will be calling AT&T on Monday.

HI

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