Probably not a Postfix problem...?

2 msg	MASQUERADING FROM BUT NOT TO

Probably not a Postfix problem...?
\ Jason Witherspoon (16 Mar 2008)
. \ Jason Witherspoon (19 Mar 2008)
. . \ (Wietse Venema) (19 Mar 2008)

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2 msg	sender+ip restrictions
14 msg	postfix-2.5 RPMs available
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2 msg	551 mail refused

Subject:	Probably not a Postfix problem...?
Group:	Postfix-users
From:	Jason Witherspoon
Date:	16 Mar 2008

I set up a postfix server on my Debian Sarge box recently. It does
one thing & one thing only-- mail comments from our website (on Linux/
Apache) to our Exchange mailserver (on a different box, naturally).
All default settings, far as I can remember (& I was shocked how easy
it was to set up!)

The web comments are mailed both to our Exchange server & to my home
address (a POP @ Speakeasy.net).

The messages to the Exchange box arrive anywhere from instantly, to
several hours late. POP receives everything more or less instantly.

Here's a sample of the syslog errors we're getting:

Feb 25 09:59:25 www postfix/smtp[17620]: 3A513B5906E2:
to=<me>, relay=mail.place.com[X.X.X.X]:25, delay=300,
delays=0.12/0.03/300/0, dsn=4.4.2, status=deferred (conversation with
mail.place.com[X.X.X.X] timed out while receiving the initial server
greeting)

Feb 25 09:59:25 www postfix/smtp[17620]: 3A513B5906E2: to=<personnel
>, relay= mail.place.com[X.X.X.X]:25, delay=300,
delays=0.12/0.03/300/0, dsn=4.4.2, status=deferred (conversation with
mail.place.com[X.X.X.X] timed out while receiving the initial server
greeting)

Having checked around on these errormessages & found precious little
on google, it *seems* like hyperactive spam precautions on the
Exchange server are quite possibly to blame. Other mail (esp. auto-
website e-mail) arrives delayed as well, though there's some
contention on this point w/our Exchange box admin, surprise surprise.

Anything to be done about this from a Postfix perspective? Messages
are being sent via "|/usr/sbin/sendmail -t -oi" in a perl script, & it
looks like the fake "From:" header doesn't make it through, if that's
any help--

Any advice/ideas very much appreciated!