Microsoft weights sender reputation via SNDS and JMRP, and rejects unauthenticated bulk mail to consumer Outlook.com addresses.
What shared inbox management is#
A shared inbox (support@, sales@) is a mailbox multiple people work from, with assignment, status, and collision detection so no message is answered twice or not at all.
Why it matters#
Without structure, shared inboxes leak customers. With it, they become a measurable team workflow.
Setting up shared inbox management for Outlook and Microsoft 365#
- Assign an owner to every incoming thread automatically or by rule.
- Track status: open, waiting, resolved.
- Set response-time targets and alert on breaches.
- Draft replies with AI using the team's past answers as style reference.
How Outlook and Microsoft 365 reports results#
Open a delivered test message in Outlook and Microsoft 365 and view the original or headers. Look for Authentication-Results and any provider-specific verdict headers. Use the provider's sender dashboard for aggregate reputation.
Common mistakes#
- Sharing one login instead of using delegated access.
- No visibility into who replied.
Frequently asked questions#
Should we use a shared mailbox or a helpdesk?
Under a few hundred messages a week, a well-managed shared inbox works. Beyond that, ticketing adds needed structure.
Does Outlook and Microsoft 365 require shared inbox management?
Microsoft weights sender reputation via SNDS and JMRP, and rejects unauthenticated bulk mail to consumer Outlook.com addresses. Treat shared inbox management as required for any meaningful volume.