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How to Use AI for Email Marketing: Boost Open Rates

How to Use AI for Email Marketing: Boost Open Rates
Walter Hennery·July 28, 2026·5 min read

AI can double your email open rates. Here's how to use it for subject lines, copy, and automation.

AI Email Marketing Prompts

TaskPrompt
Subject lines"Write 10 subject lines for [email topic]"
Email body"Write a 200-word email about [topic]"
Welcome series"Create a 5-email welcome series for [audience]"
Re-engagement"Write a re-engagement email for inactive subscribers"

Free AI Email Tools

  • Mailchimp: Free up to 500 contacts, AI subject line generator
  • ConvertKit: Free up to 1,000 subscribers
  • MailerLite: Free up to 1,000 subscribers
  • ChatGPT: Write all your email copy for free
The subject line hack: Ask AI to write 10 subject lines, pick the best 2, and A/B test them. AI-generated subject lines consistently outperform human-written ones. Keep under 50 characters for mobile.
The bottom line: Use AI for subject lines and copy. Use free tools like Mailchimp (500 contacts free). A/B test AI subject lines. Personalize with merge tags. Email marketing still has the highest ROI of any channel at $36 for every $1 spent.