Keep it concise and punchy
The subject line’s job is to grab attention, not convey the entirety of the email’s content. Focus on one core message, without filler words or excessive detail.
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Email subject line best practices
Make it personal (actually personal)
Including the customer’s first name is fine, but what really resonates is content that’s specific to their activity or preferences—both known and predicted.
Always be testing what works for who
Urgency, curiosity, humor, emojis—A/B test different tactics to see what resonates, then keep at it. Some things may work especially well for specific segments.
8 email subject line principles to increase open rates
Master the art of crafting irresistible email subject lines with proven best practices. Learn how to personalize effectively, create a sense of urgency, keep it concise, and test different strategies to find what truly drives opens.
Dive into advanced tips that go beyond the basics and optimize your emails for maximum impact.
Hook, line, and 70% of revenue with Klaviyo email and AI
Svenfish serves up fresh seafood daily. With Klaviyo email and AI, their marketing stays just as fresh delivering tailored messages to customers who’ll actually bite.
“I love how Subject Line AI helps us analyze what subject lines have worked in the past, and gives us concise inspiration. I almost always use it to generate subject lines.” Sreevats R., Product manager
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