I have 4 mail accounts I use on a regular basis. Two from yahoo, one from my ISP, and one from Microsoft. I have them all setup n the mail app on my iPhone 6 with 8.2. One of my yahoo accounts will sometimes not download the messages but will update the 'unread' counter. So in other words, it pops up and says I have 2 unread messages (or however many) but the messages themselves don't appear. Sometimes they show up eventually, sometime they don't ever show up. I noticed It did this on the Junk folder today. It said I had 9 unread messages but no messages were downloaded. I looked on my laptop and they were all there. I have deleted the account twice and added it back and it does the same thing. I have restarted the phone multiple times. I have closed the mail apps and restarted it multiple times as well.... Anyone have any advice on what to try to fix this?