Ask HN: Is the most recent iOS update sending old unsent mail drafts?

For the second day in a row I've gotten what seem like strange emails from family members with iPhones. All of them are incomplete in some way like they were in draft but never finished and some of them can be dated by subject matter to years ago.

I've gone through Gmail access logs with everyone, there isn't any unauthorized access, but the iPhone messages in question are just sent from SMTP rather than the detailed authorized app description usually provided (but with the same IP, so it's coming from the same phone).

The one thing they have in common is that they did an update overnight.