We really need a way to delete system messages or even our own mail posted to the inbox. I just tried to post a war strategy for my team, it was 5 posts the first 2 pages of it did not show due to the mailbox being full, this is not the first time we have had problems with new posts not showing due to old event announcements. I scrolled through the inbox and we hax 29 day old messages that still show up but 2 of the 5 new ones posted today were cut off.