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Write it like a colleague would.

A subject line that looks like marketing gets read like marketing. Write it the way a colleague would: short, plain and about them.

  • Subject lines
  • 3 min read
  • Updated 30 October 2026

Three emails in Dan’s inbox

Growth Team08:02 Unlock 3X Growth With Our AI Platform!Limited spots left for our exclusive programme. Reads like an ad
Sara Khan09:14 Quick questionHi Dan, I wanted to reach out because we help companies like yours. Could be anyone
Sara Khan09:14 your checkout pageYour checkout page asks for an account before payment. Reads like a note
The subject sits next to your name, so it’s read first. Illustrative example.
On this page

The subject is read first

In the inbox, your subject sits next to your name, before a word of your email. People sort their mail in a second: colleagues and customers on one side, newsletters and pitches on the other.

Colleagues write short, plain subjects, like “invoice for march” or “your Leeds page”. Marketing writes Title Case, exclamation marks and promises. If yours looks like marketing, it gets sorted with marketing.

The teardown

The same email, before and after. Tap or swipe the card to flip it.

BeforeTo Dan Moore

Reads like an ad.

SubjectBoost Your Conversions By 300% With Our Proven System!! Title Case and a promise

Hi Dan,

Are you struggling to turn visitors into customers? Asked of everyone

Our proven system has helped hundreds of brands grow. Nothing you can check

Book a demo today!

Best,
Sara

No opt-out line No way to say no

Illustrative example. People and companies are made up.

How to write it

  1. Name their thing.

    Their page, their product, their team or their town. “your checkout page” is about them before they open it.

  2. Keep it short.

    Two to five words. On a phone, long subjects get cut off anyway.

  3. Write it plainly.

    Like a note to someone you work with. No Title Case, no exclamation marks, no emoji.

  4. Match your first line.

    If the subject says “your checkout page”, the first line should be about their checkout page.

  5. Keep it honest.

    No “Re:” or “Fwd:” on a first email. It’s a trick, and people who spot it won’t trust the rest.

Check your subject line

Paste the subject of an email you’re about to send.

A quick style check, not a spam test. It runs in your browser and nothing is sent.

Six subject lines to copy

Each one names something of theirs. Replace every field before you send, and use the last one only if it’s true.

your {{page}} page

question about {{project}}

idea for the {{team}} team

your {{role}} job ad

{{city}} {{service}}

{{name}} suggested I write

More templates

Before you send

  • Two to five words
  • No Title Case, exclamation marks or emoji
  • About them, and matches your first line
  • No fake “Re:” or “Fwd:”

Then check the first line: delete your first sentence.

Send it with one of these

Three of the tools we review. See what each one costs before you pick.

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  • Lots of inboxes, high volume

    Instantly

    Unlimited sending accounts and warm-up on paid plans.

  • Email and LinkedIn together

    lemlist

    Email, LinkedIn and calls in one sequence on the Multichannel plan.

  • Finding the emails too

    Snov.io

    Email finder, verifier and sequences in one tool.

  • Not sure yet?

    Compare all five

    Side by side: what each one is good at, and who it’s for.

1 / 4

Not sure which tool?

Tell us what you’re trying to do and we’ll point you at one tool, not five. Spotted something out of date? Tell us and we’ll fix it.

Email info@coldmailing.co.uk

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