[exim] Don't add received header for scanned mails

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FilAutorData ()
M+\Matthias Rieber
||MJeremy Harris
||MMatthias Rieber
||MWolfgang Breyha
||MMatthias Rieber
||MWolfgang Breyha
|M\Heiko Schlichting
M||Heiko Schlittermann
||MHeiko Schlittermann
|MMatthias Rieber
MJeremy Harris