El Capitan And Apple Mail


Since upgrading to 10.11 I am having problems deleting mail in the Apple Mail programme. I delete an email only for it to bounce back into my inbox within a few seconds. Any suggestions anyone?

P.S. I have rebuilt the mailbox with no success.
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In Geostationary Orbit
I found at work in EL Captain machine to delete all email settings (after writing them down first). Then home down the 'option' key while adding servers then you will be able to add the setting manually back. This usually fixes strange "upgraded" Mail settings!