On 28/11/2018 14:08, Sebastian Nielsen via Exim-users wrote:
> The problem is when the user, in the IMAP client, selects to "backup"
> or "export" the mails to harddrive.

You could take the extreme-violence route:

Copy the Subject: to a new header.  Then just delete
any top-bit-set bytes in the Subject header, and don't
care about any encoding.
-- 
Cheers,
  Jeremy

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