I can send and receive sbcglobal.net emails in out look for 2 accounts; I can send but NOT receive for the 3rd business account. Losing contracts. Please help!

I have 3 sbcglobal.net emails. Two work flawlessly in Outlook the third I can send but cannot receive.  This is a business account I've had for nearly 20 years so it is vital to my business.  AT&T says it's not them as I can see the emails on att.net.  But I can't create customer folders on att.net and will lose all I have. How can 2 accounts work and I rarely works in the last few months?  Any assistance???
Bev AndersonAsked:
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David Johnson, CD, MVPOwnerCommented:
If I was you and email was my businesses lifeblood I'd subscribe to office365 or GSuite
Hypercat (Deb)Commented:
Have you checked all the basic account setup parameters - user name and password, send and receive server names, etc.?  What happens when you try to receive email - do you get an error message and if so what does it say? Have you checked your computer event logs to see if there is any related error event happening when you try to receive the email?
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