Dear Postfix folks,
Apple Mail violates the standard [1], resulting in attachments only
being shown in the HTML view.
This behaviour is to be expected given the incorrect MIME structure
of the message. It is:
multipart/alternative
text/plain
multipart/mixed
text/html
attachment
So when selecting the plain part, you don't see the attachment
associated with the alternative part.
The message structure should be:
multipart/mixed
multipart/alternative
text/plain
text/html
attachment
If we wanted to detect such messages, and add a notification or extract
the attachment, what component would be the right part for such message
alteration? A milter?
(I am aware, that this will break with end-to-end encryption (GPG or
S/MIME).)
Kind regards,
Paul
[1]: https://bugzilla.mozilla.org/show_bug.cgi?id=1362539#c3
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