Strange encoding when forwarding plain text email within the organisation [closed]

I have an issue,

When I get a plain text format email (or sending one to myself) and then forwarding it within my organisation. Strange things happens with Swedish Characters ÅÖÄ and special characthers like @£$€.

Test+AOUA5AD2-+AEAAowAkIKwAew-

First hand plain text email nothing happends.But when i send/forward an email that i already got that is in plain text format the above happens.

I have standard html/utf8 setting for my outlook and this doesnt happend to just me.