Some mails not being received in the mailbox: Character set name (UNKNOWN) is invalid or not installed

Hi all

My Exchange 2013 CU11 environmento is not able to deliver some received emails to the mailboxes.

The tracking shows the following:

Source: ROUTING
EventId: FAIL
RecipientStatus: {[{LRT=};{LED=550 5.6.0 CAT.InvalidContent.Exception: InvalidCharsetException, Character set name (UNKNOWN) is invalid or not installed.; cannot handle content of message with InternalId 32985348833358, InternetMessageId <1603050614323BAB_2924291@efactura-trx>.};{FQDN=};{IP=}]}

The only KB (https://support.microsoft.com/en-us/kb/2536702) I've found is related to Exchange 2010 and the solution is a configuration of the edge (i dont use it).

Any idea about the cause and/or a possible solution?

Thanks all!

------------------------
http://SomoIT.net