On the stock e-mail app, I can't seem to figure out how to select all e-mails to be able to mark them as read or delete them. Since I have to use a non-Gmail account as POP3 instead of IMAP, e-mails I read or delete elsewhere don't sync with my phone as well. So I get left with a bunch of old e-mails I've already read or deleted in the stock E-mail app.