Old E-Mails Re-Appearing

I have 9 email addresses on my Note, only one of which is a POP account. Why is it that old emails keep reappearing as new every so often? I generally delete emails after I've read them, unless they're extremely important, and for the most part, this inbox is empty. Old emails reappear as new, which drives me nuts.



Thoughts?



Also, is there a quick way to empty the trash folder in an email account?

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