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Exchange 2010 rejects messages witch UNKNOWN charset

My transport server fails to deliver messages which have wrong charset in message subject or attachment description. Example:

Content-description: =?UNKNOWN?Q?=22statystyki_wg?= metod

RecipientStatus from Message Tracking:
550 5.6.0 CAT.InvalidContent.Exception: InvalidCharsetException, Character set name (UNKNOWN) is invalid or not installed.; cannot handle content of message with InternalId xxx

I understand why would someone want to reject these messages on antispam or antivirus server - but  forcing rejection on hub transport is wrong. This is messaging server - I don't want it to reject any messages. I have edge antispam for that!

Does anyone has an idea how to turn it off? Or at least replace UNKNOWN to proper charset string in header?
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mpilarczyk
Asked:
mpilarczyk
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1 Solution
 
e_aravindCommented:
Can you check after upgrading the servers to Exchange server 2010 sp1 rollup 2.
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mpilarczykAuthor Commented:
I didn't install Rollup 2. None of the issues it repairs happens to my system.
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mpilarczykAuthor Commented:
FYI:

http://exchangeserverpro.com/microsoft-releases-update-rollup-4-exchange-2010-sp1

Update Rollup 4 contains patch 2394554:
You have a Microsoft Exchange Server 2010 mailbox.
You send an email message to a recipient by using this mailbox.
The subject line of the email message contains unsupported encoded characters, such as ISO-2022-JP-2 encoded characters.

In this scenario, the email message is not delivered to the recipient. Additionally, you do not receive a non-delivery report (NDR) message.

This issue occurs because Exchange Server 2010 does not process an email message if the subject line contains unsupported encoded characters. Additionally, an exception occurs when Exchange Server 2010 tries to generate a NDR message.
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mpilarczykAuthor Commented:
UR4 solves this
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