Using Mozilla to copy Email between an IMAP system and Lotus Notes, I got an issue with S/MIME signed messages. Actually, it look like Lotus Notes change the encoding of some part of the Email:
< Content-Transfer-Encoding: 8bit
to
Content-Transfer-Encoding: quoted-printable
Obviously, the digital signature will not be valid under this condition.
My Person document have the flag:
Format preference for incoming mail: Keep in senders’ format
Any others place to set the 8bits encoding on?