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Outlook 2016 continually prompts for username and password constantly and will not sync

For the past month and a half or so Outlook 2016 will continually prompt for username and password to a point where I have to close it and re open it.  It also will not sync unless I close and reopen it.  This is getting really annoying.  First level support was all but useless.  I'm a network and email tech and have done pretty much everything on my end.  including:

1.  Deleting and recreating my profile, my .ost file, and any other file involved.

2.  Changed my password about 5 times, this will work for about an hour then it starts doing the same thing though it still doesn't sync.

3.  Verified all my settings and tested.

Basically first level support said they don't support 3rd party products like Outlook and to use the webmail.  This is not acceptable.  I read a similar post a couple of weeks ago where moving their account to a different email server solved the trick.  

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  • Now not only am I having the same problem as everyone else is posting about email wanting a password continually, some of my friends are saying emails they are sending to me are getting bounced back with this error -  

    UNBELIEVABLE!!

    This is the mail system at host mx.cox.rs.oxcs.net.
    
    I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below.
    
    For further assistance, please send mail to postmaster.
    
    If you do so, please include this problem report. You can delete your own text from the attached returned message.
    
                       The mail system
    
    <nikang3@cox.net>: delivery temporarily suspended: host
        mx.east.cox.net[68.1.17.3] refused to talk to me: 554 eastrmimpi110.cox.net
        cox 146.20.112.69 rejected - no rDNS - Refer to Error Codes section at
        http://postmaster.cox.net/confluence/display/postmaster/Error+Codes for
        more information.
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