當由exchange 2016信箱發信，其類別會被清除(exchange 2007之後都會發生) Message Categories Are Lost When You Send Messages from an Exchange 2007 Mailbox

Message Categories Are Lost When You Send Messages from an Exchange 2016 Mailbox

當由exchange 2016信箱發信，發現其類別會被清除(exchange 2007之後都會發生) 。

因為exchange預設是會將類別清除，所以將其設為false即可

可利用Get-TransportConfig查看ClearCategories的狀態是什麼，未下指令前應該為true。

指令：

To use the Exchange Management Shell to disable clearing categories from messages sent
Run the following command:

Set-TransportConfig -ClearCategories $False

官網資訊

https://technet.microsoft.com/en-us/library/cc308574(v=exchg.80).aspx

https://technet.microsoft.com/zh-tw/library/bb124151%28v=exchg.160%29.aspx?f=255&MSPPError=-2147217396