Consider the following scenario:
In the Japanese version of Microsoft Exchange Server 2013 Service Pack 1 (SP1), you create a new Inbox rule for email forwarding. To do this, you use the following command:
New-InboxRule -Name "<name>" -ForwardTo "<SMTP address>" -StopProcessingRules $true
Note In this command, <name> represents the actual rule name, and <SMTP address> represents the actual SMTP address.
From another account, you send a Double-Bytes Character Set (DBCS) message to the mailbox that has this Inbox rule.
You log on to the mailbox of the "ForwardTo" address, and then you open the forwarded message.
In this scenario, the text in the From field of the forwarded message is garbled.
This issue occurs because of HTML encode for message in text format.
To resolve this issue, install Exchange Server 2013 Cumulative update 8.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.