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After upgrading to Sierra, for all my encrypted emails (mime) the attachments disappeared.
I do not see anything just a question mark instead of the attachment in each email.
With a backup I reimported a second time the mails but it hasn't changed anything.
Is ti a Sierra bug ? How to solve it ?
iMac, OS X Yosemite (10.10.3)
More information:
I opened one email with an attachment directly copied from my El Capitan backup and opened it in Sierra Mail app by doublecliking. It was working perfectly the attachment was visible.
I searched the same email in Sierra Mail App and the attachment was not anymore readable (just a question mark appears instead).
Conclusion: I thing that, while importing mailboxes, sierra mail is corrupting a part of the emails (.emlx) which are after import not anymore readable !
Problem finally fixed in 10.12.4 released today. Even previously sent encrypted emails with attachments open properly.
I can confirm it was fixed with 10.12.4, and also the missing encryption symbol in some encrypted messages has finally re-appeared.
Mail attachments disappeared with Sierra
