How to create a rule in Outlook on Mac: step by step for 2026

A rule is a short instruction that Outlook follows every time a message comes in. You might want newsletters kept out of your inbox, or mail from one client marked for follow up. Once the rule is set, you stop repeating the same clicks by hand. This guide covers current Outlook for Mac, the way Microsoft describes it today.

Check which Outlook you are using first

Microsoft's rule page covers three versions: Outlook for Microsoft 365 for Mac, Outlook 2024 for Mac and Outlook 2021 for Mac. The page gives no build numbers, so the menu bar is your test. If Outlook > Settings has a Rules pane, the steps in this guide match your screen.

If your menu shows Tools > Rules instead, you are on legacy Outlook. Legacy rules sit under Client Rules for IMAP and POP accounts, and EXCHANGE SERVERS for Exchange accounts. Microsoft says support for legacy Outlook for Mac ends in October 2026. That date has passed, so plan to move to the current app.

Some secondary sites give an earlier cutoff, October 1, instead of the end of the month. Microsoft's own page is the one to trust on this point.

How rules run in current Outlook for Mac

Current Outlook for Mac creates server-side rules only. Microsoft says client rules are no longer supported in the Mac app. A server-side rule runs on the mail server, not inside the Outlook app on your Mac. You build it in Outlook, but the work happens on the server.

When a rule misbehaves, look at its settings and its place in the list first. Those are the parts you control from the Mac app.

Create a rule from an email you already have open

This route is faster when your rule is about one message or one sender. Select the message in your list. On the Home tab, click Rules, then click Create Rule. Outlook pre-fills the sender, recipient and subject, so you only adjust what you need.

Say a supplier named Northwind Supply sends you an invoice every week. Open one invoice and choose Create Rule. Keep the sender condition, name the rule Northwind invoices, pick the action you want, and save it. Each new message from that sender now follows the rule. If the supplier changes its address, you can edit the condition later.

Conditions, actions and exceptions explained

Every rule needs at least one condition and one action. The condition is what Outlook checks in each new message. The action is the step Outlook takes when the check passes. Exceptions let you carve out mail that should skip the rule.

• Condition: the test a message must pass, such as a subject that includes a word.
• Action: the step Outlook takes when the test passes.
• Add another condition: a second test inside the same rule.
• Add an exception: a message that matches this test skips the rule.

Multiple Subject includes entries behave differently from what many people expect. Microsoft's known-issue note says they act as OR, so a message matches when any one entry appears. If you need separate outcomes, split the entries into two rules, one for each phrase, and test both.

A second condition is where many rules fail. A Microsoft moderator on a Q&A thread blamed rule order and Stop processing more rules, not the condition itself. Check those two settings before you rebuild the rule from scratch.

Rule order and the Stop processing setting

Outlook runs rules from top to bottom. Each rule gets a turn in the order shown in the list. Use the arrows beside each rule to move it, so the rule you need first sits near the top.

Stop processing more rules is on by default. When a rule matches and this setting is on, Outlook stops and skips the rules below it. Turn the setting off when several rules should apply to the same message.

Here is a worked example. Rule one moves all mail from a newsletter. Rule two flags any message with the word urgent in the subject. A newsletter with urgent in the subject matches both. With Stop processing on in rule one, only rule one runs. Turn the setting off in rule one, and both rules apply.

Edit, disable or delete a rule

Each rule has a three-dot menu on its row. Open it to edit or delete the rule. Choose Edit rule to change any part of it, then click Save. Choose Delete rule to remove it from the list.

The toggle beside each rule turns it on or off. Use the toggle when you want to pause a rule without losing its settings. A disabled rule stays in the list, but it does not run.

Run a rule on mail you already have

Rules act on mail as it arrives. A rule you create today does not sort last month's messages on its own. Microsoft's troubleshooting article gives the fix: open the three-dot menu and choose Run rule now.

Say you create a rule for a client's domain on Monday. Your inbox already holds a long list of older messages from that client. Run rule now sorts that older mail once. After that, the rule handles each new message as it arrives.

Why a rule does not work, and what to try first

Most failed rules have one of a few causes. Microsoft's troubleshooting article lists them, but it was written for Outlook 2016 for Mac, so some details may not match your screen. Work through the checks in order before you delete anything.

Start with the toggle. A disabled rule never runs, so check that first. Next, check the order. If another rule matches first and Stop processing is on, your rule waits its turn or never runs at all.

Then check the folder. A rule that points to a folder you deleted has nowhere to send mail. Edit the rule and pick a folder that exists.

If the rule looks right but still won't save, the Mac app may be the problem. Some Outlook for Mac rules are not saved on the Exchange server. Microsoft's fix is to create the rule in Outlook on the web or on Windows.

Outlook on the web: the same rule in a browser

Open Outlook on the web and click the gear icon. Choose Mail, then Rules, then Add new rule. The form has the same parts: a condition, an action, and optional extra conditions or exceptions.

Stop processing more rules is on by default in the web version too. Change the order with the up and down arrows. Edit a rule with the pencil icon, and delete one with the trash icon.

Exchange Online rule limits and the 256 KB space

Microsoft says Exchange Online gives all inbox rules 256 KB in total. Only enabled rules count toward that space. Disabled rules have no count limit, and Microsoft says there is no maximum number of rules.

When you reach the limit, Outlook warns you that you cannot create or update rules. The fix is to disable rules you no longer need. The article also says the quota can be decreased but not increased, so asking for more space is not an option.

The 256 KB figure comes from an admin article and may not apply to every account. If a rule won't save and you have many enabled rules, check your own limit with your admin.

Legacy Outlook for Mac and Tools > Rules

Some older guides tell you to go to Tools > Rules. That path belongs to legacy Outlook for Mac. Microsoft's current Mac page says you can only create server rules in Outlook for Mac, and client rules are no longer supported.

Some third-party guides say rules are not supported for an account, then suggest switching back to legacy Outlook. That advice conflicts with Microsoft's statement that client rules are no longer supported. Do not rely on it.

Mistakes people make with rules in Outlook on Mac

• Expecting a new rule to sort old mail. Rules act on new mail, so use Run rule now for the backlog.
• Forgetting the toggle. A rule that is off looks saved but never runs.
• Leaving Stop processing on. A rule higher in the list can block the ones below it.
• Expecting two Subject includes entries to need both words. They act as OR, so one match is enough.
• Deleting a folder that a rule still points to. The rule then has nowhere to send mail.
• Retrying the same failed save again and again. Switch to Outlook on the web, as Microsoft suggests.

Next steps after your first rule works

Test the rule on one message first. Check the folder it should land in, then check the rule list. Add the next rule only after the first one behaves the way you expect.

Keep the list short. Each enabled rule counts toward the Exchange Online space, and long lists are harder to debug. Review your rules every few months and disable the ones you no longer need.

If you send the same replies all day, look at templates and signatures next. The guide on creating an email signature in Outlook on Mac covers that. You can also see how Lazur works with Outlook screens on the Outlook page.