Problems synching Outlook 2016 with AT&T internet

[Microsoft Windows]

I am having syncing problems with Outlook 2016 and AT&T. I don't have a problem with any other internet service providers. This problem just started. I created a new profile, and it worked for a day. Then, the error came back and I can no longer receive or send emails using AT&T internet. My email and domain is hosted by another party, and I am able to access email using their webmail portal. AT&T tells me it must be an issue with Outlook. Has anyone else had this problem?

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