Tag Archives: Mail Flow

Resolving Exchange Assistants "TransientMailboxException" error, Event ID 9041

I recently encountered a mail flow problem in an Exchange 2016 environment, that was being caused by the DNS configuration on the Exchange server’s network interface. The Application log of the Exchange server was flooded by event ID 9041: Log Name: Application Source: MSExchange Assistants Date: 10/6/2016 4:56:46 PM Event ID: 9041 Task Category: Assistants… Read More »

How to whitelist addresses in Exchange Online Protection (EOP)

In order to ensure that specific emails are marked as spam or not, Exchange Online or Exchange Online Protection (EOP) support the use of transport rules, to make whitelists or blacklists, and control how messages are processed, whether if you need to bypass spam filtering in order to prevent good email messages from getting marked… Read More »

Enhanced NDRs now available in Exchange Online

Although still listed as “In Development“, the Enhanced non-delivery reports (NDRs) are now available in Exchange Online. The Enhanced NDR present a great improvement to both end users and Office 365 administrators. The new NDRs are intended to make it easier for the end-user to understand why their message was not delivered, and the added… Read More »