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Can't receive email - incoming email bounces with "blank mailhost - invalid address" error

As of the evening 12/12/2017 (Eastern Time US), some ameritech.net domain email addresses began to experience an inability to receive new emails - though the ability to send remains intact.  Incoming emails bounce with a "blank mailhost - invalid address" error.  POP3 mail is used; the error is inde

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Yahoo!/ATT email authentication not functional

sbcglobal.net email domain - authentication stopped working at 22:20CT on Sat 7/13. att.net domain was functional until 9:00CT on 7/14. Error message - Sorry we cannot process your request." Tier1.5 issued pin# resets, cleared cache, tried both IE and Chrome browsers. Current status for sbcglobal,ne

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