IT Help Guide
Outlook Not Receiving Emails.
A mailbox can stop receiving mail because of connectivity, authentication, mailbox rules, storage limits or a wider Microsoft 365 issue.
What to check
Check Outlook on the web first. If new mail appears there, focus on the desktop client. If it does not, check mailbox storage, rules, message trace and Microsoft 365 service health.
When to get IT support
If the issue affects multiple users, keeps returning, risks business data or you are unsure about the security impact, stop repeated trial-and-error and investigate the underlying cause.
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