Forum Discussion
New Shared Mailbox - getting error when sending emails
Hi all, wondering whether you may help me to understand the behavior that I experience recently with new shared mailbox in O365 created recently... I have never had problem to create shared m...
Are you trying to send to external users? Which server is generating the NDR, Exchange Online or the recipient's? It doesn't look like it's Exchange Online, and the code itself suggests a mail flow issue, not something specific to the shared mailbox or permissions on it.
What does a message trace show?
What does a message trace show?