Rules let Outlook do simple things automatically: move newsletters to a folder, flag mail from your manager, forward specific senders. Used well, they keep the inbox sane.

1. Create a rule from an existing message

The fastest way:

  • Right-click any message → Rules → Create Rule
  • A dialog suggests conditions based on that message (from this sender, with this subject, sent to this address)
  • Tick what you want, set the action (move to folder, play sound), OK

2. Manage all rules

File → Manage Rules & Alerts → see every rule, enable/disable, reorder.

Rules run top to bottom. Order matters when multiple could apply.

3. Common useful rules

  • Move newsletter from X to "Newsletters" folder, mark as read — no notification, archived for later
  • Flag any mail from your boss as High importance — keeps it visible
  • Move mail with subject containing "Calendar invite"... to Calendar (don't do this — Outlook handles invites already)
  • Move mail addressed only to a distribution list to a "Lists" folder — your inbox stays focused on direct mail

4. Server-side vs. client-side rules

Two flavors:

  • Server-side (run on Exchange): work even when Outlook is closed; available on mobile and web
  • Client-side (run only when Outlook is open): needed for actions Exchange can't do

Outlook tries to make rules server-side when possible. If Outlook says "this rule will only run when Outlook is open", that's client-side.

For mobile/web visibility, prefer simple rules that stay server-side.

5. Forward to another address

Auto-forwarding is sometimes blocked by IT (it's a common path for compromised accounts to exfiltrate data). Try setting a forward rule — if it fails, talk to IT first.

Better than auto-forward: set up a separate account and use M365 connectors or Power Automate.

6. Out of office vs. rules

Out of office (auto-reply) is separate from rules. Set it from:

  • Outlook: File → Automatic Replies
  • OWA: Settings → Mail → Automatic replies

OOO replies once per sender per absence (most configurations) so you don't spam.

7. Block a sender

Right-click a message → Junk → Block Sender. Adds to your block list; future mail goes to Junk.

For company-wide blocking (a phishing campaign), report it via Outlook's Report Message add-in instead — your IT can block at the org level.

8. Stop a rule from running

If a rule is causing problems:

  • File → Manage Rules → untick to disable (without deleting)
  • Or delete entirely

If you've inherited rules from a previous setup and don't know what they do, disable suspicious ones first and watch what happens.

9. Inbox is a mess despite rules

If your rules aren't keeping up, the inbox is the wrong tool — you might need:

  • Folders by project rather than by sender
  • A focused inbox (Outlook does this automatically with "Focused" vs. "Other" tabs)
  • A "to-do" approach where mail moves out of inbox as soon as it's actioned

10. Rules on shared mailboxes

You can create rules in a shared mailbox like any other:

  • Open the shared mailbox in OWA
  • Settings → Mail → Rules

These run for everyone reading the shared mailbox.

When to ticket

Raise a ticket if:

  • Auto-forwarding is blocked and you need an exception for a business reason
  • A specific sender keeps reaching you despite blocking
  • You need a Power Automate flow (Microsoft's "rules on steroids") set up
  • Mailbox-level retention policies need adjusting