I presume most of you are aware of issues sending to domains hosted with Office 365.
I got my first hint around 8:50 am Central when I received an NDR sending email to two valid email addresses at the same company (they use Barracuda Networks for web filtering): d193123a.ess.barracudanetworks.com Remote Server returned '554 5.0.0 <d193123a.ess.barracudanetworks.com #5.0.0 smtp; 550 permanent failure for one or more recipients ( <mailto:christina.r...@sdncommunications.com:550> <redacted>:550 5.1.1 The email account that you tried to reach does not exist. Please try 5...)>' I emailed a third valid email address at that company from Gmail and it didn't arrive. Then our monitoring system alerted us that email was queuing up on our ISP email server to a certain Office 365 hosted domain . looking at our email server outbound queue, there were lots of 451 4.3.2 Temporary server error. Please try again later ATTR1 [BN8NAM12FT065.eop-nam12.prod.protection.outlook.com]) type messages. Based on our ISP email server logs, the first example was at 8:00 am Central. Confirmed also here: https://downdetector.com/status/office-365/ Frank
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