Email Sequences Skill for Claude

Email Sequences

Plan and write email campaigns. Sequences (multi-message flows triggered by events) and broadcasts (one-off sends). Stack-agnostic. Works with any email service provider.

When to use

• Writing welcome and onboarding email sequences
• Planning lifecycle campaigns (activation, retention, win-back)
• Writing transactional emails (receipts, password resets, notifications)
• Newsletter design and writing
• Abandoned-cart or re-engagement flows
• Writing a one-off broadcast, launch announcement, or news email
• Drafting email subject lines and preview text for any send

When NOT to use

• Landing pages and conversion pages (use landing-page-copy)
• Long-form articles (use content-and-copy)
• Brand voice work (use brand-voice)
• Analytics setup for email (use analytics-strategy)

Required inputs

• The audience (segment or list)
• The trigger or context (signup, purchase, abandonment, time-based, manual)
• The goal of the email or sequence
• Brand voice
• Any technical constraints (provider, deliverability requirements)

If the audience is undefined, define it before writing. Generic emails to "everyone" perform worse than targeted ones.

The framework: 6 sequence types

Most email programs run a handful of standard sequence patterns. Each has its own goals, structure, and pitfalls.

1. Welcome / onboarding

Triggered by signup. Goal: get the user to first value.

Typical structure (5 emails over 14 days):

• Email 1 (immediate): Welcome. Confirm they're in. State what happens next. Single CTA: the next obvious action.
• Email 2 (day 1 or 2): First-value step. Help them get to a quick win or core action.
• Email 3 (day 4 or 5): Education. Show them something they probably haven't discovered yet.
• Email 4 (day 8): Social proof. Customer story or use case relevant to their segment.
• Email 5 (day 14): Outcome reminder. Where they could be in 30/60/90 days. Soft commercial cue.

Common failure: Front-loading product features. Users don't care about features yet; they care about getting to value.

2. Lifecycle / activation

Time- or behavior-triggered. Goal: move users from signup to engaged user.

Patterns:

• Sent when a user completes a milestone (first project, first invite, first export)
• Or sent when a user has NOT completed a milestone after N days
• Each email targets a specific next step

Best practice: Trigger on behavior, not just time. A user who has done 3 onboarding steps doesn't need an email telling them to get started.

3. Retention / engagement

Ongoing. Goal: keep active users engaged.

Patterns:

• Newsletter (weekly or monthly)
• Product updates
• Tips and tutorials
• Customer-only content (community, behind-the-scenes)

Cadence rule: Frequency that earns the read, not frequency that fills the calendar. Weekly newsletter that is genuinely useful beats daily newsletter that gets archived.

4. Re-engagement / win-back

Triggered by inactivity. Goal: pull a lapsed user back.

Typical structure (3 emails):

• Email 1: "We miss you" framing or value reminder. What's new since they were last active.
• Email 2: Specific incentive (discount, feature unlock, content offer).
• Email 3: "Last call" or list-cleaning email. "We'll stop emailing you unless you click this."

Best practice: Honor the unsubscribe. Aggressive win-back damages deliverability. A clean list of engaged subscribers beats a large list of inactive ones.

5. Transactional

Triggered by actions: receipts, password resets, notifications, order confirmations, shipping updates.

Best practices:

• Confirm the action that triggered the email at the top
• Include all relevant detail without padding
• Use plain language ("Your order shipped" not "Your shipment notification")
• One primary CTA (track package, view receipt, view account)
• Subject line states the action ("Your receipt for order #12345")

Highest open rates of any email type. Use sparingly for marketing nudges; over-marketing transactional emails damages trust.

6. Broadcast

One-off sends. Announcements, launches, news, time-sensitive campaigns.

Best practices:

• Subject line earns the open
• Single clear message per send
• Specific audience targeting (do not blast the entire list for narrow announcements)
• Clear CTA in the first screen-height
• Mobile-optimized (most opens are mobile)

The 5 components of every email

Regardless of sequence type, every email has the same components.

1. Subject line

The deciding factor for whether the email gets opened.

Patterns:

• Specific ("Your week 1 progress: 3 of 5 steps done")
• Curiosity ("The mistake most teams make in week 2")
• Direct ("Your invoice #12345")
• Personal ("Quick question, [name]")
• Urgency ("Last day for the team plan discount") - use sparingly

Avoid:

• ALL CAPS
• Excessive punctuation (!!!)
• Click-bait that doesn't deliver
• Generic ("Newsletter #23")

Length: 30 to 50 characters. Mobile clients truncate longer.

2. Preview text (preheader)

The line that appears below or beside the subject in most email clients.

Best practice:

• Treat as the subject's wingman
• Add what the subject line couldn't fit
• Avoid wasting it on "View this email in browser"
• 50 to 90 characters

3. Opening

The first line of the email body. The reader is deciding whether to keep reading.

Strong openings:

• Reference the trigger ("You signed up yesterday for...")
• Get to the point ("Here's what changed this week...")
• Personal ("Saw your team just hit milestone X. Nice work.")

Weak openings:

• "I hope this email finds you well."
• "Welcome to our amazing platform."
• Long throat-clearing before the actual content

4. Body

The substance.

Length guide:

• Welcome and transactional: under 100 words
• Lifecycle and activation: 100 to 250 words
• Newsletter: 200 to 800 words depending on format
• Sales sequences: 250 to 500 words

Structure:

• One core message per email (avoid "while we have you...")
• Short paragraphs (2 to 3 lines)
• Bullets or lists when content is enumerable
• Mobile-first formatting

5. CTA

The action the email is asking for.

Best practices:

• One primary CTA per email (multiple CTAs split attention)
• Button or clearly-styled link, not buried in prose
• Action verb + specific outcome ("See your dashboard" not "Click here")
• Above the fold AND repeated at the end of longer emails
• Plain text link as a fallback for users who block buttons

Workflow

For a new sequence

• Define the trigger. What event starts this sequence? (Signup, purchase, abandonment, manual.)
• Define the goal. What does success look like at the end of the sequence?
• Map the journey. What does the recipient need to know, do, or feel between trigger and goal?
• Outline emails. One purpose per email. Sequence them across appropriate timing.
• Draft email 1. Subject, preview, opening, body, CTA.
• Draft remaining emails. Each builds on the previous.
• Test the sequence. Send to yourself. Read on mobile. Time the gaps.
• Set up triggers. Configure in the email service provider.
• Measure. Open rate, click rate, completion rate per email. Sequence completion rate.

For a single broadcast

• Define the audience. Specific segment, not the whole list.
• Define the goal. One thing this email accomplishes.
• Draft subject + preview. Generate 5 to 10 variations.
• Draft body. Single message, clear CTA.
• Test on mobile. Most opens are mobile.
• Schedule. Day and time matched to audience behavior.
• Measure. Open rate, click rate, downstream conversions.

Failure patterns

• Sending to "everyone." Generic broadcasts to the full list have lower engagement than targeted segments.
• Too many CTAs in one email. Splits attention. Pick one.
• Subject line clickbait that doesn't deliver. Crashes the trust the email program is trying to build.
• Sequences that ignore behavior. Sending day-3 onboarding email to a user who already activated wastes the touch.
• Mobile-broken layouts. 60 to 70 percent of opens are on mobile. Test there first.
• Long pre-text. Burying the message under "I hope this email finds you well" wastes the read.
• Aggressive win-back. Emailing dormant users 5 times damages deliverability and brand trust.
• No measurement. Without tracking opens, clicks, and downstream conversion, you can't iterate.
• Ignoring deliverability. Sender reputation, authentication (SPF, DKIM, DMARC), list hygiene. Skip these and emails go to spam regardless of how good the content is.

Output format

Default output is a markdown document per email or sequence:

# Sequence: [Name]

**Trigger:** [What starts this sequence]
**Goal:** [Outcome at completion]
**Audience:** [Specific segment]
**Length:** [N emails over X days]

## Email 1 - [Subject working title]

**Send:** [Trigger / Day N]
**Subject:** [text]
**Preview:** [text]

[Body]

**Primary CTA:** [text]
**CTA URL:** [destination]

---

## Email 2 - [Subject working title]

[Same structure]

---

[etc.]

For a single broadcast, just one email block.

Reference files

• references/subject-line-patterns.md - Subject line patterns with examples for each sequence type.
• references/sequence-templates.md - Skeleton templates for the 6 sequence types.