mac mail question

I recently started using my mac mail and have my 2 Yahoo mail accounts coming in. I really like that I can have them both there. One thing I've noticed though is I will see new emails coming in when I open it after a day off but there won't be as many in my Inbox of either mail account as was indicated as coming in. Where are they going? Are they spam? My spam box doesn't show them either.



thanks.

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