This has been a problem forever.  It has been fixed in some releases of the PIX firmware,
but it has been broken in more releases than not.  Just give up and turn off the smtp protocol fixup. 

        no fixup protocol smtp 25

Better yet, I could suggest you do what we have done.  Dump the Cisco PIX and get a CyberGuard firewall.  They are incredible and have a much lower TCO. They have no documented vulnerabilities or reported penetrations in the past 5+ years. They are fully Common Criteria EAL4+, ITSEC E3, ... certified.

In fact now they have a deal where one can even trade in an old PIX or other firewall for a $2,000 to $10,000 rebate after one purchases a CyberGuard firewall.  Give me a call at 866-742-4777 and I would be happy to tell you about our experience with the CyberGuard products.

At 11/21/2001 01:54 PM, Mike Hoskins wrote:

> From: "Hjorleifur Kristinsson" <[EMAIL PROTECTED]>
> CISCO "mail fixup rule" is broken in the PIX!

It's broken, or Exchange is broken?  I've got a few Postfix servers behind
PIX 515UR's, and haven't seen these problems.  Exchange boxes (5.5 and
2000) drop messages left and right.

I'd heard (quite awhile back) this was a 'known' issue with Exchange
servers running behind PIXen.  Is it known to affect other/any protected
SMTP servers?

Later,
-Mike

--
"They that can give up essential liberty to obtain a little temporary
 safety deserve neither liberty nor safety."  --Benjamin Franklin


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