AT&T delays Microsoft 365 email delivery due to spam wave

By Lawrence Abrams, Bleeping Computer

AT&T's email servers are blocking connections from Microsoft 365 due to a "high volume" spam wave originating from Microsoft's service.

Starting on Monday, AT&T customers began reporting they could no longer receive email from Microsoft 365 email addresses.

When Microsoft 365 customers attempted to email an address at @att.com, @sbcglobal.net, or @bellsouth.com, AT&T servers would refuse the connection and not accept the email for delivery.



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