Sort your emails automatically with Outlook rules

The short answer

Build your rules in Outlook on the web or new Outlook, under Settings, then Mail, then Rules; rules made there live in your Microsoft 365 mailbox and run whether or not any office PC is on. Rules built in classic desktop Outlook can be client-only, which is why sorting stops when one machine goes home. Set up three: website form enquiries moved to an Enquiries folder, categorised and flagged; invoices matched on subject and sent to Accounts; newsletters marked read and filed. Put the enquiry rule top of the list, and for a shared info@ mailbox, open that mailbox in its own browser window and set its rules there.

Why rules stop working when the PC goes home

An Outlook rule is a stored instruction: when a message arrives that matches this condition, do that to it. The bit nobody tells you is that where you create the rule decides where it runs. Rules built in Outlook on the web or in new Outlook live inside your Microsoft 365 mailbox, on Microsoft's servers, so they sort mail as it arrives whether your computer is on, off or in a bag.

Classic desktop Outlook is the trap. It can build rules with actions the server can't perform, and those only run while that copy of Outlook is open on that PC. Classic even warns you ("Certain rules will only run when Outlook is on") and everyone clicks OK without reading it. The result is the small-office stall I see over and over: mail sorts itself all week, then the person whose PC holds the rules goes on holiday, their machine goes off, and nothing files anywhere.

Microsoft's guidance for new Outlook says it plainly: some rules created in classic Outlook can't be processed because they're client-side, and the fix is to recreate them. So that's the approach for everything below. Build the rules in the web or new Outlook settings screen and let the server do the work. One caveat first: this is for Microsoft 365 mailboxes; new Outlook doesn't support rules for Gmail, Yahoo or iCloud accounts, so those need setting up at the provider's end.

1. Set up the folders and categories first

Rules need destinations, so make those first: an Enquiries folder, an Accounts folder and a Newsletters folder in your mailbox. Resist the urge to make twenty; a folder per supplier is how filing systems die.

Folders and categories do different jobs, and it pays to be honest about the trade. A message can only sit in one folder, and once moved it's out of sight until someone opens that folder. A category is a coloured label. The message keeps it wherever it's filed, the colour shows in the message list, and one message can carry several. My rule of thumb: folders for things handled in batches, like invoices and newsletters, and categories for things you must not miss. A new enquiry keeps its colour even after it's been dealt with and filed.

To make a category in new Outlook, open any message, choose Categorize on the ribbon (Outlook spells it the American way), then New category. Name it New enquiry, pick a strong colour and save. You can rename or recolour it later under Settings, Accounts, Categories.

2. Build the website-enquiry rule

Find the address your website's contact form sends from: fill the form in yourself, open the notification it produces and note the exact From address. It's often something like forms@ or noreply@ on your own domain. One warning before you rely on this: rules only see mail that reaches the inbox, so if your form's notifications land in Junk, fix that first. My guide at https://lodesa.co.uk/library/spf-dkim-dmarc-setup covers exactly this.

Now go to Settings, then Mail, then Rules (the same place in Outlook on the web and new Outlook) and choose Add new rule. Name it, set the condition to match that From address, then use Add an action to stack three actions on it: move it to Enquiries, apply the New enquiry category, and flag it. The full rule is below.

Submit the form once more to test. The notification should land in Enquiries already coloured and flagged, and the flag keeps it on your follow-up list until someone clears it.

Name:       Website enquiry
Condition:  From             [email protected]
Actions:    Move to folder   Enquiries
            Apply category   New enquiry
            Flag the message

3. Send invoices to the Accounts folder

Invoices are less predictable than a form, but a subject-line rule catches most of them, because suppliers nearly always put the word somewhere in the subject. The rule below is the starting point.

If the subject rule proves too eager, tighten it with Add a condition and require an attachment as well, so a plain reply that merely mentions an invoice stops qualifying. For regular suppliers whose subject lines don't cooperate, add a second rule matching their From addresses. Two plain rules beat one clever one, and they're far easier to see through when something misfiles. One known catch: a customer replying about their invoice matches the same words. The fix is rule order, which is step 5.

Name:       Supplier invoices
Condition:  Subject contains   invoice, statement, remittance
Action:     Move to folder     Accounts

4. Sweep the newsletters out of the way

Newsletters barely need the rules screen at all, because Outlook has a shortcut built for exactly this. Right-click a newsletter in the message list, hover over Rules, choose Create rule, pick the Newsletters folder and select OK. From then on, that sender files itself. Do this to each newsletter as it next arrives rather than hunting them all down in one sitting.

If you'd rather they arrived pre-read, build the rule in Settings, Mail, Rules instead and add a mark-as-read action alongside the move, as below. The unread badge stops nagging and the folder becomes something you skim when it suits you, not a stream of interruptions.

Name:       Newsletters
Condition:  From             (each newsletter sender)
Actions:    Mark as read
            Move to folder   Newsletters

5. Put the rules in order and clear the backlog

Rules run top to bottom in the order they sit at Settings, Mail, Rules, and in Outlook on the web the Stop processing more rules option is on by default, meaning the first rule that matches a message usually gets the only say. So the order is policy: Website enquiry at the top, invoices next, newsletters last. Use the up and down arrows to arrange them. Done that way, a form enquiry that mentions an invoice still goes to Enquiries, because the enquiry rule claims it first.

A new rule only touches mail that arrives after you create it. In new Outlook the same Settings, Mail, Rules screen has a run control next to each rule that applies it to what's already sitting in the inbox. Use it to clear the backlog, and as a test bench: run each rule once and check where things actually went.

6. Decide whether Focused Inbox stays on

Focused Inbox is Microsoft's own automatic sort. It splits the inbox into Focused and Other tabs based on who you interact with, and it deliberately filters automatically generated and bulk email towards Other. That detail matters here, because website form notifications are automatically generated, so the machine can quietly decide your newest customer is noise. Your move rule sidesteps the whole question: once a message has been moved to Enquiries it isn't in the inbox, so the tabs never get a vote.

For everything else, either train it or turn it off. Train it by right-clicking a message, choosing Move, then Always move to Focused inbox (or Always move to Other inbox). Turn it off in new Outlook under View, then View Settings, then Mail and Layout, picking Don't sort my messages; in Outlook on the web it's under Settings, Mail, Layout. My honest advice for a small firm running the rules above is to turn it off. Folders plus two competing tabs is one sorting system too many.

7. Repeat it on the shared mailbox

A shared mailbox, the info@ or sales@ your whole team watches, has its own rule list, separate from everyone's personal rules, and reaching it takes one extra move because nobody signs in to a shared mailbox directly. In Outlook on the web, select your name at the top of the window, choose Open another mailbox, type the shared address and select Open. It opens in a window of its own, working like a normal account; go to Settings, Mail, Rules in that window and build the enquiry ruleset there, where it belongs to the mailbox rather than to any one person.

New Outlook has a newer route: Settings, Accounts, Shared with me, then Convert (or Add) to attach the shared mailbox as a full account, after which it shows up in the account picker for Rules and Categories. It needs Full Access permission granted by your Microsoft 365 admin, and Microsoft notes the option isn't available in every version of new Outlook yet, so the browser method above is the one that always works.

One quirk to know: Focused Inbox isn't supported on shared mailboxes, so on the team inbox your folders and categories do all the sorting. That's fine. It's the predictable system anyway.

Where this gets hard

The genuinely hard cases start with history. An office that's run classic Outlook for years accumulates dozens of rules: some server-side, some client-only, some half-broken by the move to new Outlook, where Microsoft's official fix is to recreate the rule from scratch. Working out which rule fires first, which one silently stops the rest from processing, and why the same message files differently on two people's machines is detective work, and the rule list itself gives you very few clues.

Shared mailboxes multiply that. Your personal rules and the mailbox's rules both exist, each member sees the mailbox slightly differently depending on which Outlook they run, and a missing Full Access permission shows up as things quietly not happening rather than as an error message. It's common to find three half-built rule sets fighting each other, made by three different people who each thought they were the first.

Then there's the ceiling: rules match text, not meaning. A promising enquiry forwarded by a colleague, an invoice with the subject line "March", a complaint that happens to mention the word invoice: rules either miss these or misfile them, and no pile of extra conditions buys judgement. Everything below that ceiling is well worth doing yourself; that boundary is where DIY genuinely stops.

What you end up with

• New enquiries land in one folder, flagged and colour-tagged, instead of three screens down the inbox
• Invoices and newsletters file themselves before anyone has to read them
• Rules that live in your Microsoft 365 mailbox and keep sorting with every office PC switched off
• The same sorting on your shared info@ mailbox, set up the supported way

Facts on this page last checked 14 July 2026, against support.microsoft.com, learn.microsoft.com.

Related fixes

If the rules get you most of the way but the leftovers need something that can actually read the messages, or a tangle of old rules needs unpicking first, that's work I do for small firms, and a free half-hour review at https://cal.com/lodesa/free-review is the easy way to start.