The two-bucket model — important and not important — is the lie at the heart of most email triage. It collapses too much information. "Important" hides both 'reply by 3pm or lose the deal' and 'read this newsletter sometime this week.' Those aren't the same kind of important.
Three buckets is better — important, low, and noise — but it still merges 'someone's waiting on you' with 'something interesting to read.' You can't action one and savor the other with the same energy.
Four buckets is the sweet spot, and after triaging 3.4 million emails across 1,200 operators, we're convinced it's the right number. Here's why.
Tier 1 — Critical
These are emails where a missed reply within 24 hours causes real harm. Regulatory or legal notices with deadlines. Investor counterproposals. Security incidents. Family emergencies. Same-day decisions from your CEO or board.
Tier 1 is conservative by design. Triagd errs toward over-flagging here — better to have you glance at a few false positives than to miss the one that mattered. In our beta, Tier 1 accuracy is 94%, but more importantly, our Tier 1 recall — the rate at which we catch truly-critical emails — is 99.3%.
Tier 2 — Important
These need you, but not today. Hiring loop debriefs. Partnership discussions. Strategic threads with your direct reports. Items where 24–72 hours of latency is fine but a week is too much.
Tier 2 is the largest part of the morning briefing because it's where the real work of running a business sits. It's also where AI drafts add the most value — most Tier 2 replies are short, contextual, and benefit from a starting point.
Tier 3 — Skim
Newsletters worth reading. FYI updates from your team. Non-urgent personal email. Internal status reports. Anything that adds to your understanding but doesn't require a response.
Tier 3 is where most email apps fail. They either show you everything (overwhelming) or hide everything (you miss context). Triagd's answer is to label it visibly but never put it in your morning briefing. You can skim Tier 3 in a 10-minute block on Friday afternoons — or never, your choice.
Tier 4 — Auto
Promotions. Cold pitches. Shipping notifications. LinkedIn pings. Receipts. Automated transactional emails.
Tier 4 gets filed to a folder and never shows up in your inbox unless you go looking. We don't delete it — sometimes you need to find that receipt — but we remove it from the cognitive load of triage. In a typical operator's inbox, Tier 4 is 45% of incoming volume. Removing it from your eyeline is the single highest-leverage change Triagd makes.
Why not 5? Or 10?
We tested both. Five tiers (we tried splitting Tier 2 into 'today' vs 'this week') felt over-engineered — operators ignored the new split. Ten tiers (we briefly tried a research project where every email got a 1–10 urgency score) felt arbitrary — operators couldn't tell the difference between a 6 and a 7.
Four is the number where every tier has a distinct verb attached to it. Tier 1: act. Tier 2: schedule. Tier 3: skim. Tier 4: ignore. If your taxonomy can't be reduced to verbs, it's not a taxonomy — it's a spreadsheet.
How we decide
Triagd uses Claude Haiku 4.5 for classification. The prompt includes the sender's relationship to you (extracted from your sent history), the email's content, any custom rules you've written, and the time of day relative to your timezone. For every email, the model returns a tier, a reason in 8 words or fewer, a 1–2 sentence summary, and a suggested action.
Every time you override a classification — say, you bump a Tier 3 email to Tier 1 — that becomes a learned rule for the next message from the same sender or with similar signals. The model gets sharper for you over time, without us touching it.
Triagd builds what we write about.
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