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Email server not working outside business office.

Email is not working on MacBook from locations other than at the office.  I’ve attached a screenshot of the error message and what I think is the correct screen.  Other messages (which I have not saved) have said Outlook could not verify incoming or outgoing IMAP.  Is this something you can correct online?

Screen Shot 2016-06-02 at 10.11.23 PM

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We’ll need a way of testing the connection from another outside source besides your local wifi network due to the fact that it is problematic based on your location.  Maybe our better option is for me to remote in to your computer when you are home.  Either that or I take the computer home over night to solve the issue.  The problem with working on your computer remotely is that I may have to change some settings that will kick the computer off the network temporarily and we’ll have to re establish our connection several times.  
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