Email marketing in 2026 has a deliverability problem: spam filters are smarter, inboxes are more crowded, and subscribers are more selective than ever. These 8 prompts cover the full email lifecycle: subject lines tested by psychology type, welcome sequences mapped to buyer awareness stages, cold outreach that avoids spam triggers, deliverability audits that find exactly what's killing your inbox placement, and A/B testing with actual statistical rigor. Built from real cold email and nurture campaign expertise.
PROMPTS
Generate and rank high-open-rate subject lines by psychology type
Generate high-performing email subject lines for: [topic/offer/announcement] Audience: [who they are, what they care about, relationship with your brand] Email type: [newsletter / promotional / transactional / re-engagement / cold outreach] Brand voice: [formal / casual / witty / urgent / conversational] Current average open rate: [percentage] My top 3 best-performing subject lines ever: [paste them] Industry: [your niche] Generate 30 subject lines in 5 categories: 1. CURIOSITY GAPS (6) — open a loop the reader must click to close 2. SPECIFICITY & NUMBERS (6) — exact figures that feel too specific to ignore 3. PERSONALIZATION (6) — using [first name], company, or behavior triggers 4. URGENCY & SCARCITY (6) — real time pressure, not fake countdown timers 5. PATTERN INTERRUPTS (6) — unexpected formats (questions, lowercase, emoji, one word) For each subject line: - Matching preview text (the second line recipients see) - Character count (flag any over 50 chars for mobile truncation) - Spam trigger check: flag words that hurt deliverability Then: - Rank the top 10 overall with reasoning - Identify 3 subject lines to A/B test against each other (and why these 3) - 5 subject line patterns to AVOID in [industry] (with examples of what not to do)
PRO TIPS
Include your 3 best-performing past subject lines in the prompt. AI pattern-matches what works for YOUR audience specifically, not just generic best practices. A subject line that gets 45% opens for a SaaS list might bomb for an ecommerce list.
Tested Mar 15, 2026
Build an onboarding series that converts subscribers into customers
Build a welcome email sequence for new [subscribers / customers / trial users]. Product/service: [what you offer and price point] How they signed up: [lead magnet / free trial / purchase / webinar / content upgrade] Main value proposition: [why they signed up — the promise that got them] Desired end action: [purchase / upgrade / book a call / activate feature] Sales cycle length: [how long people typically take to convert] Current welcome sequence: [describe what you have now, if anything] Design a [5-7] email sequence: For each email: 1. Send timing (days/hours after trigger) with reasoning 2. Subject line + preview text (2 options each for testing) 3. Full email copy (150-250 words — short, scannable, mobile-first) 4. Single CTA (one action per email, never multiple) 5. Psychological principle driving this email (reciprocity, social proof, loss aversion, etc.) 6. Segmentation trigger: what happens if they click vs. don't click vs. reply Also include: - The 'golden window': which email in the sequence is most critical and why - Deliverability safeguards: plain text ratio, link count limits, from-name strategy - When to suppress: if they convert mid-sequence, what emails to skip - Benchmark open/click rates to expect at each stage
PRO TIPS
Map your sequence to buyer awareness stages: unaware → problem-aware → solution-aware → product-aware → most-aware. Each email moves them exactly one stage forward. If you try to jump from unaware to purchase in one email, you'll lose them.
Tested Mar 15, 2026
Write cold outreach that lands in primary inboxes, not spam
Build a cold email campaign for: [what you're selling or what meeting you want] Target prospect: [title, company size, industry] What you offer: [your value prop in one sentence] Why now: [why this prospect needs this now, not later] Social proof: [clients, results, credentials — your best one-liner] Sending infrastructure: [email tool, domain age, daily send volume] Design a 3-email sequence: 1. EMAIL 1: THE OPENER (Day 1) - Subject line: short, lowercase, looks like a human wrote it - Body: under 80 words, no links, no images, no HTML - End with a question, not a calendar link - Personalization hooks: what to customize per prospect 2. EMAIL 2: THE FOLLOW-UP (Day 3-4) - Subject line: reply to Email 1 thread - Body: under 60 words, add one piece of value or proof - Still no links — the link comes only if they reply 3. EMAIL 3: THE BREAKUP (Day 7-8) - Subject line: creates mild FOMO or closure - Body: under 50 words, easy out, no guilt - Optional: one link (case study or resource) since this is the last touch Also include: - DELIVERABILITY CHECKLIST: spam trigger words to avoid, sending limits, warm-up schedule - PERSONALIZATION FRAMEWORK: 3 data points to research per prospect (takes 2 min each) - RESPONSE HANDLING: templates for positive reply, objection, and 'not interested' - VOLUME MATH: expected reply rates and how many prospects to contact for [X] meetings
PRO TIPS
The best cold emails are under 80 words with zero links in the first email. No images, no HTML formatting, no tracking pixels, no calendar links. Just plain text that reads like a human typed it on their phone. Every 'professional' element you add increases your spam score.
Tested Mar 15, 2026
Diagnose why emails land in spam and fix it systematically
Audit my email deliverability and tell me what's hurting inbox placement. Current setup: - Email platform: [Mailchimp / ConvertKit / Instantly / Smartlead / etc.] - Sending domain: [your domain] - Domain age: [how old] - Average daily send volume: [how many emails] - Current open rate: [percentage] - Current bounce rate: [percentage] - SPF/DKIM/DMARC status: [configured / not sure / not set up] - Recent spam complaints: [if known] - Type of emails: [marketing / cold outreach / transactional / mixed] Paste a recent email for analysis: [paste full email with subject, body, links] Audit: 1. AUTHENTICATION CHECK - SPF, DKIM, DMARC status and what to fix - Custom tracking domain setup - Sending IP reputation assessment 2. CONTENT ANALYSIS - Spam trigger words and phrases in subject + body - HTML-to-text ratio (flag if too HTML-heavy) - Link count and link reputation - Image-to-text ratio - Unsubscribe link presence and compliance 3. LIST HYGIENE - Bounce rate assessment (flag if over 2%) - Engagement-based segmentation recommendations - Re-permission campaign design (for old/cold lists) - Sunset policy: when to remove unengaged subscribers 4. SENDING PRACTICES - Volume ramp-up schedule for new domains - Optimal sending frequency for my list size - Warm-up protocol for cold outreach domains - Throttling recommendations 5. ACTION PLAN - Priority 1 fixes (do today — these are killing deliverability) - Priority 2 fixes (do this week) - Ongoing monitoring routine (15 min/week)
PRO TIPS
Send a test email to a fresh Gmail, Outlook, and Yahoo account before any campaign launch. If it hits spam on even one provider, don't send to your list. Fix the issue first. The damage from one spam-filtered campaign can tank your sender reputation for months.
Tested Mar 15, 2026
Design automated nurture sequences with smart branching
Design an automated drip campaign for: [lead nurture / onboarding / upsell / event follow-up / re-engagement] Trigger event: [what starts the sequence] Audience segment: [who enters this campaign and their awareness level] Campaign goal: [the specific conversion you want] Timeline: [total days/weeks the campaign runs] Existing content assets: [blog posts, case studies, webinars, tools to reference] Max branches allowed: [2-3 — keep it manageable] Design the complete campaign: 1. CAMPAIGN FLOWCHART - Entry trigger and qualification criteria - Each email node with timing - Decision branches: opened vs. didn't open, clicked vs. didn't click - Exit conditions: when someone leaves the campaign (converted, unsubscribed, or completed) - Re-entry rules: can someone go through this campaign twice? 2. EMAIL COPY (for each node) - Subject line + preview text - Full body copy (150-250 words, scannable) - Single CTA per email - What content asset to reference or link 3. AWARENESS STAGE MAPPING - Which buyer awareness stage each email targets - How each email moves the prospect one stage closer to purchase - Where to inject social proof, urgency, and objection handling 4. MEASUREMENT - KPIs per email (open rate, click rate, reply rate, conversion) - Benchmarks to expect - When to intervene manually (hot lead signals) - Monthly optimization routine: what to test and when to retire underperformers
PRO TIPS
Keep your drip campaigns to 3 decision branches maximum. Every branch doubles your maintenance burden and halves your per-branch sample size. AI loves building complex decision trees — force it to simplify by setting a branch limit upfront. Simple campaigns you maintain beat complex campaigns you abandon.
Tested Mar 15, 2026
Design email experiments with statistical rigor
Design statistically rigorous A/B tests for my email campaigns. Current metrics: - List size: [total subscribers] - Average open rate: [percentage] - Average click rate: [percentage] - Average conversion rate: [percentage] - Send frequency: [how often you email] Email platform: [what you use] Biggest performance gap: [where you most want improvement] Previous tests: [what you've tested before and results] Build a 4-week testing plan: 1. WEEK 1: HIGHEST-IMPACT TEST - What to test and why this moves the needle most - Specific hypothesis: 'If we change [X] from [A] to [B], [metric] will improve by [estimated %] because [reasoning]' - Control vs. variant with exact copy for both - Minimum sample size for statistical significance (95% confidence) - How long to run before calling a winner 2. WEEK 2: BUILD ON WEEK 1 RESULTS - Test design that leverages what you learned - Hypothesis and copy for both variants 3. WEEK 3: DEEPER OPTIMIZATION - Test a structural element (send time, segmentation, personalization depth) - Hypothesis with expected outcome 4. WEEK 4: ADVANCED TEST - Test a behavioral trigger or automation element - Hypothesis and measurement plan Also include: - TESTING RULES DOCUMENT: when to call a winner, minimum run time, how to handle inconclusive results - SAMPLE SIZE CALCULATOR: formula for my list size to reach significance - COMMON MISTAKES: 5 testing errors that invalidate results (with fixes) - COMPOUNDING MATH: if all 4 tests produce modest wins, what's the cumulative impact?
PRO TIPS
Test one variable at a time, and test the highest-impact element first. Subject lines affect 100% of recipients; button color affects only those who already opened, read, and scrolled to the CTA. Start at the top of the funnel and work down. Most email marketers test the wrong things.
Tested Mar 15, 2026
Build a newsletter that people actually want to open every week
Help me build (or fix) my newsletter. Newsletter status: [starting from scratch / existing with problems] Audience: [who reads this and why they should care] Topics I cover: [3-5 content areas] Frequency: [weekly / biweekly / monthly] Current subscribers: [number, if existing] Current open rate: [percentage, if existing] Time I can spend per issue: [hours] Monetization plan: [sponsorships / premium tier / lead gen / none yet] Deliver: 1. NEWSLETTER IDENTITY - Name options (5) with tagline for each - Unique positioning: what makes this different from other newsletters in [niche] - One-sentence value prop for the signup page 2. FORMAT DESIGN - Repeatable section structure (intro, main story, quick hits, spotlight, CTA) - Word count targets per section (keep total under 1000 words for weekly) - Visual design recommendations (headers, dividers, formatting) - Content sourcing system: where to find material each week in 30 minutes 3. SAMPLE ISSUE - Full draft of issue #1 with all sections populated - Subject line and preview text 4. GROWTH PLAYBOOK (0 → 1,000 subscribers) - 5 free growth tactics ranked by effort-to-result ratio - Signup page copy with conversion optimization tips - Cross-promotion strategy with complementary newsletters - Content upgrade ideas to capture email from blog traffic 5. RETENTION STRATEGY - How to maintain 40%+ open rates as you grow - Re-engagement triggers for subscribers going cold - Feedback collection: how to learn what readers want more/less of
PRO TIPS
Write 4 issues before you launch. If you can't produce 4 in advance, your format is too ambitious. Adjust sections and word counts until the newsletter takes 50% of the time you initially planned. A newsletter you can sustain for 52 weeks beats a beautiful one that dies after 8.
Tested Mar 15, 2026
Recover cold subscribers before you lose them for good
I have [number] subscribers who haven't engaged in [timeframe]. What they originally signed up for: [lead magnet / offer / content] Last topic they engaged with: [if known from email platform data] What's changed since they went cold: [new features, offers, content, company milestones] Current list hygiene: [do you regularly clean your list?] Platform: [email tool] Build a 4-email re-engagement sequence: 1. EMAIL 1: THE PERSONAL CHECK-IN (Day 1) - From a person's name, not the brand - Acknowledge the silence without being guilt-trippy - Offer a compelling reason to re-engage (not a discount — value) - Under 100 words, plain text feel 2. EMAIL 2: THE VALUE BOMB (Day 4) - Best content or resource from the past [timeframe] they missed - Curated, not comprehensive — 3 items maximum - Each item with a one-sentence hook for why it matters 3. EMAIL 3: THE EXCLUSIVE OFFER (Day 8) - Something only for re-engaging subscribers - Clear deadline or scarcity (real, not manufactured) - Social proof: what other subscribers are getting from staying active 4. EMAIL 4: THE CLEAN BREAK (Day 14) - Honest, respectful final email - Clear choice: click to stay or do nothing to unsubscribe - No guilt, no manipulation — a professional goodbye - Explain why you're removing them (deliverability health) Also include: - SUNSET POLICY: exact criteria for when to remove unresponsive subscribers - WIN-BACK METRICS: expected recovery rate (realistic, not optimistic) - POST-CLEANUP PLAN: what to do with the healthier, smaller list - PREVENTION STRATEGY: 3 tactics to stop subscribers from going cold in the first place
PRO TIPS
Send your re-engagement sequence from a personal name (founder or team member), not your brand name. Cold subscribers are 2-3x more likely to open an email from 'Sarah at [Company]' than '[Company Newsletter].' The personal touch signals this isn't just another automated blast.
Based on actual testing — not assumptions. See our methodology
Gemini
Best for drip campaign architecture, deliverability audits, and technical email setup. Creates structured, implementation-ready campaign flowcharts with clear decision logic. Strong on authentication and infrastructure recommendations. Weaker at writing emotionally engaging email copy.
Results from Gemini 2.5 Pro · Tested Mar 15, 2026ChatGPT
Best for subject line generation, cold email copy, and newsletter design. Produces the most natural-sounding email prose that reads like a human wrote it. Strong at adapting tone between formal B2B and casual DTC. Can over-optimize for opens at the expense of deliverability — always cross-check spam triggers.
Results from GPT-4.1 · Tested Mar 15, 2026Claude
Best for welcome sequences, A/B test design, and statistical rigor in testing plans. Builds psychologically sophisticated email journeys with genuine awareness-stage progression. Most honest about expected conversion rates and sample size requirements. Catches statistical errors other models miss.
Results from Claude Sonnet 4 · Tested Mar 15, 2026Grok
Best for punchy subject lines, re-engagement copy, and emails with a distinctive voice. Writes with a directness that cuts through inbox noise. Strong at creating urgency without sounding desperate or salesy. Less effective at building long-form nurturing sequences that require patience and gradual trust.
Results from Grok 3 · Tested Mar 15, 2026One email, one ask. Every email with multiple CTAs converts worse than one with a single clear action. If you have three things to say, send three emails. AI will try to stuff everything in — tell it to pick one CTA per email. The PS line is the exception: it's the second most-read part of any email and can carry a soft secondary ask.
Deliverability trumps copywriting. The best email ever written is worthless if it lands in spam. Before optimizing subject lines and copy, run the Deliverability Auditor to make sure your authentication (SPF, DKIM, DMARC), sending reputation, and list hygiene are solid. Fix the pipes before polishing the message.
Cold email rules are completely different from newsletter rules. Newsletters can have images, HTML, and multiple links. Cold emails should be plain text, under 80 words, with zero links in the first touch. If you're doing cold outreach with your newsletter template, you're landing in spam. Use the Cold Email Campaign Builder for outbound and separate prompts for your subscriber list.