Fix S/MIME encryption with latest Exchange 2016
* src/cryptcontroller.cpp (CryptController::update_mail_mapi): Set overrideMimeTag to application/pkcs7-mime for smime enc. * src/mimemaker.cpp (create_mapi_attachmend): Add overrideMimeTag paramenter. (create_top_encryption_header): Rearrange header for S/MIME enc.
Comparing outlooks own S/MIME mails with GpgOL mails lead to this.
Tests show that this way the mails do pass the exchange
server. With only slight variations we get errors.
- GnuPG-Bug-Id: T3853