Exchange Online – MANUAL FACTORY

Concept diagram of message tracing to examine the mail delivery path with a magnifying glass

Microsoft 365 / Troubleshoot missing email with message trace

Find missing Exchange Online email by searching sender, recipient and time, then interpreting delivery events. Learn the 90-day retention window, report limits and the checks needed after a message is marked Delivered.

Stylized DNS servers, email envelopes and authentication shields beside a cloud mailbox.

Microsoft 365 / Email DNS records: check MX, SPF, DKIM, and DMARC

Understand mail routing, sender authorization, signatures, and DMARC alignment. Check the correct SPF scope, enable DKIM with tenant-provided values, roll out DMARC gradually, and verify results in newly received message headers.

Three staff members holding separate keys around a shared mailbox, with reading and sending icons.

Microsoft 365 / Create a shared mailbox and grant Full Access and Send As

Create a shared mailbox, assign reading and sending permissions separately, and test access in Outlook. Compare Send As with Send on Behalf, check sent-message copies, and remove permissions safely during handover.

Conceptual diagram comparing reception through personal mailbox, shared mailbox, and alias

Microsoft 365 / User mailboxes, shared mailboxes, and aliases: which should you use?

Choose a user mailbox, shared mailbox, or alias based on inbox ownership, delegated access, sending permissions, and handover needs. Check licensing conditions, add an alias, and verify receiving and reply behavior before moving an address.