Question 1

What makes a good email subject line?

Accepted Answer

A good email subject line is 30-50 characters, creates curiosity or urgency, avoids spam trigger words, includes personalization when possible, and clearly communicates the email's value to the reader.

Question 2

How long should an email subject line be?

Accepted Answer

The ideal length is 30-50 characters (5-9 words). Mobile devices show about 30-40 characters, while desktop clients show 50-60. Front-load the most important words to ensure they are visible on all devices.

Question 3

What words trigger spam filters?

Accepted Answer

Words like 'FREE', 'BUY NOW', 'URGENT', 'ACT NOW', 'LIMITED TIME', 'GUARANTEED', and 'NO OBLIGATION' are common spam triggers. Avoid excessive capitalization and multiple exclamation marks as well.

Question 4

Do emojis improve email open rates?

Accepted Answer

A single relevant emoji can increase open rates by 5-10%. However, overusing emojis (2+) can decrease engagement and trigger spam filters. Test what works for your audience.

Question 5

Should I A/B test my subject lines?

Accepted Answer

Yes. A/B testing is the best way to optimize subject lines. Test one variable at a time (length, emoji, personalization, question vs statement) and measure open rates to find what resonates with your audience.

Email Subject Line Tester

Frequently Asked Questions

Need Professional Email Marketing?

Email Subject Line Tester

Frequently Asked Questions

Need Professional Email Marketing?