21 Subject Lines That Get Replies (and When to Use Each)

21 Subject Lines That Get Replies (and When to Use Each)

Made for the reader — “What’s in it for you?”

  1. Make them want it
    Example: Save 3 hours this week — quick idea inside
    When to use: Use this when you ask for a meeting or help and show them the benefit.
    Tip: Tell what they get.

  2. Use their name
    Example: Alex — quick question
    When to use: Use this for important people to get their attention.
    Tip: Keep it short.

  3. Ask for their view
    Example: Your view on the Q3 plan?
    When to use: Use this when you want their opinion on a big topic.
    Tip: Say you want their idea.

  4. Show you know their interests
    Example: An idea for [Project/Topic] you might like
    When to use: Use this for someone who cares about that topic.
    Tip: Fill the bracket with their project.

  5. Say it helps both sides
    Example: How my team can help reduce churn (drop-off)
    When to use: Use this when both groups can win. (Churn means people stopping something, like leaving a product.)
    Tip: Say how both sides win.

  6. Show you’re like them
    Example: Product leaders — quick collab idea
    When to use: Use this when writing to a group of similar people.
    Tip: Use the group name.

  7. Give a small, real compliment
    Example: Loved your talk — quick follow-up
    When to use: Use this when you admire someone. Be honest.
    Tip: Don’t be fake.


Clear, confident, and useful

  1. Tease a useful fact
    Example: One insight from our data you’ll want to see
    When to use: Use this when you want a short call back or meeting.
    Tip: Make them curious.

  2. Give a small, clear suggestion
    Example: Try this A/B test next week
    When to use: Use this when you want teammates to try one idea.
    Tip: Be helpful, not bossy.

  3. Be direct when a decision is needed
    Example: Decision needed: Approve Q4 hires
    When to use: Use this when you need a quick yes or no from a boss.
    Tip: Be short and clear.

  4. Keep it fresh — no boring words
    Example: 3 metrics to check before launch
    When to use: Use this for smart readers who get many emails.
    Tip: Give useful info.

  5. Use a picture in words
    Example: Make onboarding feel like a welcome mat — 2 ideas
    When to use: Use this for creative or sales ideas.
    Tip: Paint a small picture with words.

  6. Be extra polite for sensitive asks
    Example: Request: Could I ask a 10-minute favor?
    When to use: Use this when asking strangers or for delicate help.
    Tip: Ask gently.

  7. Use the right jargon for experts
    Example: CPA spike analysis — quick Q
    When to use: Use this for people who know special words.
    Tip: Only use jargon with experts.


Build relationships and show care

  1. Start friendly
    Example: Hope you’re well — quick question about support
    When to use: Use this to calm someone or when contacting customers.
    Tip: Be kind first.

  2. Say thanks and add next steps
    Example: Thanks for the intro — next steps?
    When to use: Use this after someone helps you.
    Tip: Say what comes next.

  3. Ask a deep, honest question
    Example: What’s the one challenge keeping you up at night?
    When to use: Use this when you want a real, honest chat.
    Tip: Be ready to listen.

  4. Mention where you met
    Example: Following up on our chat at [Event]
    When to use: Use this after you meet someone at an event.
    Tip: Name the event.

  5. Offer a softer option
    Example: A gentler option for the decision you’re facing
    When to use: Use this when someone must make a hard choice.
    Tip: Be comforting.

  6. Ask them to do good
    Example: Join us: a small way to support [cause]
    When to use: Use this for volunteer or charity asks.
    Tip: Say how they help.

  7. Fix the problem without blame
    Example: Small fix that solves the reporting error
    When to use: Use this when you point out a mistake but want to keep trust.
    Tip: Offer the quick fix.

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