I must be missing something blindingly obvious. I’m sure at least one of the Evolution hackers has an iPhone. But as far as I can tell, Evolution cannot send mails with attachments to iPhones such that the iPhone can show the attachment.
It looks like Evolution can only send multipart/mixed, and Mail.app on iPhone only understands multipart/alternative.
Now, far be it from me to be surprised at Apple not understanding established standards. But really – am I the only one having this problem ?