Are short subject lines always the winners?

Are short subject lines always the winners?

You've heard "keep subject lines under 5 words." It's a tidy rule, but it's not a law, and treating it as one costs you. Short lines can feel vague ("Big news!"), while a longer, specific line often earns more opens because it tells people exactly what's inside.

How to choose wisely:
— Match length to clarity, not a word count. "Your March invoice is ready" beats "Update."
✅ Test two subject lines on your next send: one short, one descriptive, and compare opens.
— Front-load the important words, since phones cut off long lines.

The real rule is curiosity plus clarity, at any length.

Tiny homework: rewrite one vague subject line you've used into a specific one.

New here? Start with the basics above.