The 4D Method So You Never Drown in Email Again

The 4 actions: Delete, Do, Delegate, Defer

Faced with an email, there's only one decision to make among four. This method is the operational core of Inbox Zero, the productivity method it comes from, developed by Merlin Mann. The principle: every email read once leads to an immediate decision, rather than being put off indefinitely without ever really settling on one of the four options.

• Delete: the email adds nothing, delete it without hesitation
• Do: the reply takes under 3 minutes, do it right away
• Delegate: it's not yours to handle, forward it
• Defer: it needs more time, schedule a specific slot to come back to it

To judge whether a reply really fits within the 3 minutes of Do: if it comes down to one or two sentences with nothing to look up, that's generally the case. As soon as it requires checking another document, a colleague, or the full thread history, it shifts into Defer.

Concrete examples by category

4D by profile

The four actions stay the same, but how they're distributed changes with the type of work. A freelancer who single-handedly manages quotes, follow-ups, and invoicing in one inbox mostly uses Do and Defer, with very little Delegate since there's rarely anyone to forward to (see MyCleark for freelancers). In a small team, Delegate takes up more room: each teammate keeps their own Gmail inbox, and forwarding an email to the right colleague avoids handling it yourself (see MyCleark for small businesses).

4D and the priority score: two complementary logics

4D answers "what to do with this email", not "which one to start with". On a busy inbox, applying the 4 actions in order of arrival means handling an urgent request only after ten newsletters read out of habit. A priority score (see how an AI-powered daily email digest works) answers that second question upfront, so 4D gets applied in the right order rather than the chronological one.

Putting 4D into practice in Gmail

The method stays theoretical without the right reflexes to execute it quickly. In Gmail settings (Advanced tab), keyboard shortcuts speed up processing noticeably: # to delete, E to archive after replying, L to apply a label.

• Delete: shortcut #, or unsubscribe directly from the message for recurring newsletters
• Do: reply, then archive with E rather than leaving the message in the main inbox
• Delegate: forward it, and keep track with a "Delegated" label so you know where things stand without reopening the thread
• Defer: a "To handle" label shown in the Multiple Inboxes view, next to the main inbox, with a slot reserved on your calendar to clear it

The limits of the manual method

4D works, but every email requires a conscious decision. On a high-volume inbox, this discipline becomes hard to sustain over time: decision fatigue pushes you to let emails pile up in the inbox "for later", which defeats the purpose of the method. The most common symptom: a "To handle" label that grows week after week without ever being cleared, until it becomes a second inbox as full as the first.

Common mistakes with 4D

• Defer becomes a dumping ground: without a recurring slot actually blocked off on the calendar, the "To handle" label never gets cleared
• Delegate with no follow-up: forwarding without keeping track loses sight of what was actually taken care of
• Delete out of excessive speed: when in doubt about whether a message matters, archiving it rather than deleting it leaves a way back
• Wanting to automate everything at once: Delete and Delegate lend themselves well to automation, Do and Defer remain decisions that require human judgment
• Confusing Defer with a postponed Do: an email "deferred" with no specific slot on the calendar isn't deferred, it's simply forgotten until it becomes urgent again

Gmail also offers its own safety net: follow-up reminders ("nudges") flag emails you haven't replied to or forwarded after a few days. It's a good signal for Delegate and Do items that slipped through the cracks, without replacing 4D discipline itself.

Automating part of 4D

Gmail filters can automate part of Delete and Delegate (see creating advanced Gmail filters), for simple, stable rules: a known sender, a fixed keyword in the subject line. For Delete/Delegate that depends on the actual content of the message rather than fixed rules, or for a sender you've never seen before, AI sorting takes over where filters reach their limits: it reads the actual content of every email to decide where to file it, with no rule to maintain. That same classification also feeds a daily digest sent automatically (see how an AI-powered daily email digest works), so you can see at a glance what's been classified without reopening every email. Freelancers and small teams get a different use out of it: see MyCleark for freelancers and MyCleark for small businesses.

Frequently asked questions

This article is part of our complete guide to managing your Gmail inbox. To automate 4D without having to think about it, discover MyCleark's pricing, from €5.99/month per inbox.