entourage -> exchange mail frozen in smtp queue

Hi

We're using windows 2000 server and exchange 2000
in a mixed enviroment (windows and mac os x). The apple
users are using entourage to get and send their mails.
Most of the time everything works. But sometimes*
the mails send by the apple users are frozen**
(word by word translation from german "fixiert" is "fixed"
but i think the right term is frozen...)
immediately after arriving in the exchange smtp queue
(No Error message on the client).
The mail stays there until i delete it...
This problem only occours in the combination of
entourage and exchange.

Apple users can send mail using exchange webaccess or
a IMAP/SMTP client (like mozilla thunderbird) without
problems.


What i've tested:

* Mac User on windows outlook: no frozen mails

* Windows User on apple Entourage: not enough testing done,
but at least one time a mail was marked as frozen
in the smtp queue.

* Mac and Windows user on Exchange webaccess: no frozen mails

* Capturing the data send via webdav from entourage to the
exchange server (with ethereal). I compared what happens
if a mail gets frozen and what happens if the mail gets through.
(you can't predict when a mail gets frozen so i had to send a lot of
mails to get one frozen mail)
But i didn't find something unusal...
(Ethereal's output looked nearly the same;
no strange email headers or something like this)


I don't see a soloution to this problem...
My only guess is that this is some kind of weird broken licence
check...
(we've sometimes employees who bring there one apple in
for work; i can't check if they're using legaly licensed software;
they connect to the exchange server via entourage too)
I hope somebody here knows a soloution...

BTW: The software (both windows and apple) is patched with
the newest updates.

* sometimes means:
happens quite randomly;

** this happend for every apple user at least on time
(I don't think that this is an account problem)


Thank you in advance for your Answers.

.

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