I logged on after maintenance to find that I had a message. I went to look what it said so I went to the nearest mailbox. But I didn't find anything. I looked at other pages to see if I missed something and it was hiding in there, but no, nothing.

I even tried deleting some messages because I thought they were clogging up space. Again, nothing. The message wouldn't show. Is there something I can do to fix this? Also, I received a message from the Auction House. Getting that mail works perfectly fine.

Oh, and the person I was trying to mail was on my friend list if that helps anything. I didn't ignore him, and he didn't ignore me.

I have never heard of this problem. Maybe by sending in a RT here will help. Hopes it get fixed. Sorry. QQ

Mail is sorted by time remaining, player mail has a 3-day timer, vs 15 days for AH buy/sells.

Delete all your mail and see if you can find it.