I can reproduce an issue I'm having with apple mail in IOS 9.2 every time and was wondering if others can test too?
I am running IOS 9.2 on an iPhone 6S+
All emails have been cleared out. i.e. none in my inbox, draft, sent items or deleted items.
I am running 3 x POP email accounts and 1 x IMAP account.
1) I create a new email on my phone and send it to one of the 3 POP email addresses.
It's only a simple email. Subject: "Test" and body "This is a test email".
2) I check my inbox half a minute later and the email arrives.
3) Either left-drag to immediately send the email to the trash bin OR click on the email to read it (it displays correctly at this stage) and then hit the trash bin icon to send it to the trash bin.
4) Next I select my trash bin icon and can see the email sitting there with the correct subject text but "This message has no content" in place of the body.
ISSUE!
When I click on the email once again the correct subject text is displayed but "This message has not been downloaded from the server" is displayed in place of the body.
ISSUE!
5) I then click the folder icon followed by the sent icon which should move the email to my sent items. The animation indicates that the email has been moved to my sent items.
If I then go to my sent items box the email has completely disappeared from the device. i.e. not in the sent items bin and no longer in the trash bin.
ISSUE!
I have recorded a video of this process using my iPad and could upload it somewhere but would have to remove/blur email addresses and I'm not sure how to do that.