Troubleshooting

Exchange Online Protection 550 5.4.1 Recipient address rejected: Access Denied. AS(201806281)

Today, I found myself working with a customer that was experiencing delivery failures to some Office 365 recipients from all external senders.

As problems go, this one definitely finds itself in the “interesting” category.  No, it’s never good to have “interesting” problems (just ask a doctor).… [ Continue reading ]