Email Drip Builder

A drip sequence is a contract with the user: they gave their attention, and the sequence returns it with value at the right moment. Sequences that read like mail merges get unsubscribes; sequences timed to behavior build habits. The costly mistake this skill prevents is the fixed-timer drip that keeps selling activation to users who already activated - the fastest way to teach a new user that these emails can be ignored.

Inputs to collect

1. The activation milestone - the one action that means the user is activated (first invoice sent, first project shared). This is the exit trigger for the entire sequence. If undefined, define it first - a drip without an exit condition is a leak, not a funnel. Pull it from lifecycle-journey-map if that map exists.
2. The intermediate milestones - 2-4 steps between signup and activation, each trackable as an event.
3. Current activation rate and where users stall - determines which email gets the most work.
4. Independently useful assets - tips, benchmarks, shortcuts, case studies each email can deliver.
5. Sending constraints - ESP capabilities for event-based triggers vs. timers; if only timers exist, flag the sequence as degraded and say which rules cannot be enforced.

Operating procedure

1. Define the exit triggers before writing any email. Primary: the user completes the activation milestone → leave the sequence immediately and move to the engagement track. Secondary: conversion to paid, unsubscribe, or hard bounce → leave immediately. Sending onboarding to activated or converted users erodes trust and skews every metric downstream.
2. Anchor Email 1 on the first value moment. It sends immediately on signup and has one job: the fastest path to core value. No feature tour, no company history. One action, one link. Subject states the outcome, not the product name.
3. Gate Emails 2+ on behavior gaps, not timers. Each email fires only if the user has not done the target action; if they did it, skip forward to the next milestone's email. Fixed-timer sequences waste sends on the already-activated.
4. Give every email an independent payload. Each must deliver something useful on its own - a tip, a benchmark, a shortcut, a case study - so a user who unsubscribes after Email 3 still got value. This lowers unsubscribe pressure and builds sender trust.
5. Write subjects as promises, not headlines. The body must pay off the subject exactly. Bait-and-switch subjects boost opens and tank clicks. The best subjects are specific and slightly incomplete - the body finishes the thought.
6. Cap the sequence at 8 emails. If a user has not activated after eight, a ninth will not fix it. Route them to a dormant segment and hand them to win-back-campaign. Endless drips create unsubscribe pressure across the whole list.
7. Instrument per-email metrics - open, click, and the target action's completion - so the stalling step is visible, and the email covering it gets rewritten first.

Worked artifact - 5-email activation drip (project-management SaaS; activation = first project shared with a teammate)

Exit rules for this sequence: share event fires at any point → user leaves immediately for the engagement track. Upgrade to paid → leave immediately. Still inactive after Email 5 (extendable to 8 max) → dormant segment, hand to win-back-campaign. Total span ~11 days; every gap is a behavior check, not a fixed calendar.

Deliverable

Produce a sequence spec containing: the activation milestone and all exit triggers, the email table (number, timing rule, skip-if condition, single job, promise-subject, one CTA), the independent payload per email, the 8-email cap with the dormant handoff, and the per-email metrics to instrument.

Do NOT

• Do NOT run on fixed timers when events are available - timers send activation pitches to activated users.
• Do NOT keep sending after conversion or activation - leaving the sequence on conversion is the single most important rule; violating it burns the trust the sequence built.
• Do NOT give an email two jobs or two CTAs - one action, one link.
• Do NOT open Email 1 with a feature tour or company history - it has one job: first value, fastest path.
• Do NOT write bait subjects - opens without clicks poison the sequence's metrics and the sender's reputation.
• Do NOT extend past 8 emails - route non-activators to win-back-campaign instead.
• Do NOT use this for cart recovery or dormant reactivation - those have their own timing physics (abandoned-cart-sequence, win-back-campaign).

Quality bar

The sequence ships only if: every email after the first has an explicit skip-if condition; the activation milestone and conversion both trigger immediate exit; every subject is a promise the body pays off; every email carries an independently useful payload; no email has more than one CTA; the sequence is 8 emails or fewer with a named dormant handoff; and per-email completion of the target action is instrumented so the weakest step is findable.