Constant mail fetching stopping

Constant mail fetching stopping

I am experiencing e-mail fetching stopping all the time. I have tried a series of things to start it again. I was told to go into the e-mail account delete the top e-mail and the rest should come through but it seems that every e-mail after that stops the fetching and i is taking a long time to get them all through the mail filter...
 
Any Ideas??

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