Guild Wars 2

For a long time, I didn’t bother deleting mail I got from other players, because I never got that much and I was hoping to unlock the now-defunct achieve for having a full inbox. I rarely delete anything for it, some are kept for posterity at this point. However, because of this, some of the older mails from players have gone past what I think I can see, but it still counts towards my mailbox limit. Help?

Screenshot the mails you are keeping for posterity and save the screenshots to a folder you can easily find again. Then delete. Repeat for older ones as they are uncovered.