Can AI build a free replacement for my email marketing tool?
Nah. Sending newsletters reliably means handling deliverability, unsubscribes and anti-spam laws, which paid tools do for you. Most have free tiers for small lists. Use AI to write the emails instead.
01Why nah
- Homemade mass email often lands in spam.
- Unsubscribe handling and consent records are legal requirements in many places.
- Writing and planning emails is where AI saves real time.
Sponsor slot · openFeatured tool for this task. A labeled card for one relevant tool.
Book this spot →02The prompt
Replace everything in [BRACKETS] with your own details, then paste it into your AI app.
You are an email marketer. My list and audience: [WHO, HOW MANY] What I'm sending: [NEWSLETTER, PROMOTION] Key news or offer: [DETAILS] Your task: write this month's email. Rules: - MUST write 2 subject lines, a preview line and the email (under 250 words). - MUST include one clear call to action. - NEVER use misleading subject lines. Give me: the email, ready to paste into my email tool.
03Steps
- Pick a tool with a free tier that fits your list size.
- Use the prompt to write each email.
- Send a test to yourself first.
04What can go wrong
- Only email people who opted in.
- Check free-tier limits before your list grows.
05What to use
Any major AI chat app, plus an email marketing tool.
06Our test runs
2 runs, each with a different made-up sample. 1 of 2 passed every check.
Run 1 · Llama 3.3 70B · graded by GPT-OSS 120BOct 9, 2026Passed
The made-up sample:
[WHO, HOW MANY]Entrepreneurial freelancers and small‑business owners who run e‑commerce sites, 2,874 active subscribers across North America and Europe.[NEWSLETTER, PROMOTION]Newsletter[DETAILS]Introducing OpenMail AI – a free, open‑source platform that automates list segmentation, A/B testing, and delivery analytics. Built on GPT‑4, it writes subject lines, predicts optimal send times, and integrates with any CRM. Sign up now for a 30‑day trial and get a ready‑to‑use template library.
- Include exactly 2 subject lines
- Include a preview line
- Include one clear call to action
- Email under 250 words (122 words, counted by code)
- Didn't make up details we never gave it
What came back (excerpt):
d Automation Preview Line: Discover how OpenMail AI can simplify your email marketing workflow and increase conversions Dear Fellow Entrepreneurs, As e-commerce site owners, we know how crucial email marketing is to driving sales and growth.
Read the full answer
Subject Line 1: Boost Your Email Game with OpenMail AI Subject Line 2: Revolutionize Your Email Marketing with AI-Powered Automation Preview Line: Discover how OpenMail AI can simplify your email marketing workflow and increase conversions Dear Fellow Entrepreneurs, As e-commerce site owners, we know how crucial email marketing is to driving sales and growth. However, managing and optimizing our campaigns can be time-consuming and overwhelming. That's why we're excited to introduce OpenMail AI, a free, open-source platform that automates list segmentation, A/B testing, and delivery analytics. Built on GPT-4, OpenMail AI writes subject lines, predicts optimal send times, and integrates with any CRM, making it a game-changer for your email marketing strategy. To get you started, we're offering a 30-day trial, complete with a ready-to-use template library. Sign up now for your 30-day trial and start streamlining your email marketing workflow. Click the link below to get started: [Insert CTA button: Start Your 30-Day Trial] Best, [Your Name]
Check that the email body does not exceed 250 words.
Run 2 · Llama 3.3 70B · graded by GPT-OSS 120BNov 4, 2026Passed with a catch
The made-up sample (a messier one):
[WHO, HOW MANY]Our list is a mix of small‑biz owners and solo‑entrepreneurs – roughly 1,150 contacts. Mostly US‑based (about 80%), a handful in Canada and UK. Industries: marketing, SaaS, e‑commerce. Some are just signed up via our lead‑magnet, others are long‑time readers.[NEWSLETTER, PROMOTION]This month’s email is a hybrid newsletter + promotion – we’ll share a quick industry roundup and then introduce our new AI email builder with a free‑trial offer.[DETAILS]We’re rolling out a free‑for‑3‑months AI‑powered email composer that writes subject lines, preview text and body copy. Early‑adopters also get a 20% discount on premium plans if they upgrade by Dec 31.
- Provide exactly 2 subject lines
- Provide a preview line
- Include one clear call to action
- Never use misleading subject lines
- Made up details we never gave it
Details it made up: “marketing automation is on the rise”, “SaaS companies are focusing on customer retention”, “e-commerce businesses are leveraging AI for personalized experiences”
What came back (excerpt):
Speaking of AI, we're excited to introduce our new AI-powered email composer! This game-changing tool writes subject lines, preview text, and body copy for you, saving you time and increasing engagement.
Read the full answer
Here are two subject line options, a preview line, and the email: **Subject Line Options:** 1. Introducing AI-Powered Email Builder - Free Trial Inside 2. Boost Your Email Game with Our New AI Composer **Preview Line:** Discover how our new AI email builder can save you time and increase engagement **Email:** Hi there, As a small-biz owner or solo-entrepreneur, staying on top of the latest industry trends is crucial. Here's a quick roundup: marketing automation is on the rise, SaaS companies are focusing on customer retention, and e-commerce businesses are leveraging AI for personalized experiences. Speaking of AI, we're excited to introduce our new AI-powered email composer! This game-changing tool writes subject lines, preview text, and body copy for you, saving you time and increasing engagement. For a limited time, try it free for 3 months. As an early adopter, you'll also receive 20% off our premium plans if you upgrade by December 31. **Start your free trial now and take your email marketing to the next level** [Insert CTA button: Start Free Trial] Best, [Your Name]
Check that the email stays under the 250‑word limit.
How each run works: we fill the prompt with a made-up sample, run it once in Llama 3.3 70B, and GPT-OSS 120B grades the answer against the prompt's own rules. Word limits are counted by code, and every quote flagged as made up is checked against the full answer. Your results can differ. How we test.
Prompt packReplace Paid Apps 10 step-by-step prompts that go further than this one, $19.
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