Email Subject Encoding

Email Subject Encoding

I use PowerShell scripts to run nightly integration jobs and send email from PowerShell to the ticketing system when errors occur. These emails look fine when sent to Outlook but Service Desk Plus shows the subject as
 
=?ASCII?Q?HR Integration Message?=
 
When it should be just "HR Integration Message". I've tried using different encoding from PowerShell including ASCII, UTF7, UTF8 and UTF32 and all cause the same problem. Strangely though, when I use Unicode, the subject is rendered as:
 
䠀刀 䤀渀琀攀最爀愀琀椀漀渀 䴀攀猀猀愀最攀
 
No character encoding strings at the front but it's in Chinese or some other Asian language... Does this mean the server is set to default to this language?

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