Subject Line A/B Pack
Six email subject lines across four proven angles for a single article or newsletter issue.
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What you get
Get six email subject lines across four proven angles for a single article or newsletter issue, delivered in a text format, perfect for A/B testing and improving your open rate (OR).
Who it's for
- Newsletter creators looking to boost engagement
- Estate agents sending regular property updates
- Farm-box businesses emailing subscribers about their weekly share
- Substack writers seeking to optimise their subject lines
Use cases
- Sending a weekly newsletter to subscribers and wanting to test different subject lines
- Creating a follow-up email to non-openers and needing a fresh subject line approach
- Launching a new email campaign and wanting to A/B test subject lines for better open rates
- Writing a regular email update for a community and seeking to improve engagement
- Preparing a promotional email and needing subject lines that grab attention without being spammy
- Optimising email subject lines for better performance on mobile devices
FAQ
what is a good open rate for a newsletter
A good open rate for a newsletter is around 25-30%, but it can vary depending on the niche and audience. Using A/B tested subject lines can help improve open rates.
how long should an email subject line be
Email subject lines should be concise, ideally under 9 words, to improve open rates and avoid being cut off on mobile devices.
do emojis in subject lines increase open rates
Emojis in subject lines can be effective, but they can also be seen as spammy. It's best to test their impact on your specific audience.
how do you a/b test newsletter subject lines
You can A/B test newsletter subject lines by creating multiple versions and sending each to a portion of your list, then comparing the open rates to determine the most effective one.
what words trigger spam filters in subject lines
Words like 'free', 'limited time', and 'urgent' can trigger spam filters in subject lines. It's best to avoid using these words or to test their impact on your deliverability.
how do i write a subject line that doesn't feel like clickbait
To write a subject line that doesn't feel like clickbait, focus on being direct, specific, and varied in your approach, avoiding vague verbs and sensational language.
Last updated: 2026-06-28