I have not seen this mentioned. When my desktop Mac is asleep (Retina Display late 2014 running 10.10.5, Mail 8.2) and I am away, all the spam which is ordinarily caught and put into the Spam folder goes right to my iPhone. If I am out for several hours, I can end up with a lot of spam mail clogging up my phone. However, after a few hours, it will update and move the older spam to the spam folder, but the newest arrived spam is still on the phone.
This seems to happen periodically, maybe once every month or so, and then mysteriously goes back to behaving as usual, namely the spam may appear on the phone momentarily and is then whisked away to my desktop spam folder.
Anyone have any idea what’s causing this or how to fix it? Any help greatly appreciated. Thank you!