Merge branch 'subparts' into 'master'
Some (rare) mails are not properly showing their attachments (not Apple kind ones), as explained in MER#1574. This is due to the fact that the routine that looks for attachments works on one level only of mail subpart. The proposed MR adds a recursive call to look for an attachment on any possible sub-level. An example of non-working email is attached to the MER bug. This MR corrects the behaviour for this mail. See merge request !3
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