*Original Title: Sent emails not being received

I have windows 7 and using windows mail. For years I had no issues than for the last few weeks all kinds of problems. My problem now is that emails go into my sent folder but are never received by the recipients. I can send to myself with no problem but to no one else. I can send online with Horde and can send from my other email account set up in windows mail just not my default work account.  I have deleted and reinstalled account but no change. Please help!