Simple Inbox Rules to Set Up Before Using AI

Do you need AI at all? How plain filters, labels and rules in Gmail and Outlook work, and when they're enough for a shared inbox.

Up to date as of 1 November 2026

Try plain rules first. If your mail is mostly a few kinds of message from a few senders, rules can do much of what an AI sorter does. Nothing is guessed.

Each rule has a condition and an action.

Rules versus AI

	Plain rules	AI sorting
How it decides	Exact matches you set	A guess from the message content
Predictable?	Yes, it does the same thing every time	Not always
Setup	One rule at a time	Needs a plan, a trial and checking
Suits	Regular senders, receipts, newsletters, notifications	Mixed mail from new people

The rules column is the dull but dependable one. Wikipedia lists organising incoming email and removing spam among the common uses of mail filters.¹

Gmail filters

Google says a filter can send mail to a label, or archive, delete, star or forward it.² The quickest way to make one is to open a message and choose "Filter messages like these".²

One catch: Google says that a filter set to forward messages only affects new messages.²

Outlook rules

Microsoft says rules let you act automatically on email that arrives in your inbox.³ Each rule needs a name, a condition and an action.³ A new rule normally works on arriving mail only. Existing messages need a separate step to run the rule on them.³

Wikipedia notes that Outlook's filters are called rules. That's why you'll see both words.¹

Starter rules for a shared inbox

Label mail from your accounting or payment software as billing.
Send newsletters and promotions to a "read later" label, not the main view.
Mark mail from your biggest customers or your bank as important.
Move automatic notifications, such as shipping updates, out of the way.
Leave everything else in the main inbox for a person.

Review the rules every few months. A rule for a supplier you stopped using does nothing, and a rule that's too broad can hide a real message.

When rules aren't enough

Rules struggle when one sender writes about different things. The topic is then in the wording, not the address. A customer might write about an invoice one day and a complaint the next. That's where an AI sorter can help, as covered in sorting and labelling with AI.

Doing the rules first has a side benefit. It shows you which labels you really use, which makes any later AI setup simpler to describe and to check. It also shows how much of your mail was never hard to sort in the first place. You may find the answer to "do we need AI?" is "not yet".

Adding AI later? The first note here shows where a person still reads the mail. A rule matches words and senders. It won't notice that a customer sounds angry.

Reference list

Email filtering, Wikipedia
Create rules to filter your emails, Google (Gmail Help)
Manage email messages by using rules in Outlook, Microsoft Support