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The Slash Subject Line Kit: [Your Company] / [Their Company]

This is the Slash Subject Line Kit from the reel. One punctuation mark makes your cold email look like a shared project instead of an ad.

The subject line

Subject line formula
[Your company] / [Their company]

Examples:
WayneFlow / Acme
BrightPath / Summit Dental

Jesse Itzler shared this on X and says it works a lot. David Ogilvy said five times as many people read the headline as the body, and your subject line is the headline. A slash looks like an internal project between two companies, not a sales email.

How we use this at WayneFlow

We test subject lines on every campaign before we scale. In one small pilot, that testing helped get a 4% reply rate and 103 sales opportunities from 10,284 people. A good subject line gets the open. A good list and offer get the reply, and that's the system we build for clients.

Want us to set this up for you? Book a free call →

The 4 steps

  1. Your name first, theirs second.
  2. No emojis, no "free", no capital letters shouting.
  3. Line one is about them: their new office, their new hire, their new product.
  4. End with one small ask: "Worth a look?"

Write the email with Claude

Prompt
My company: [name], what we do: [one sentence].
Prospect company: [name], website: [link].

Write a cold email with the subject "[my company] / [their company]". First line: something specific and recent about them. Then one sentence on the result we could get them. End with "Worth a look?". Under 70 words, plain text, no emojis.

Quick answers

Does this work for every industry?

It works best in B2B, where a partnership between two companies makes sense. Test it against your current subject line on two small lists.

Lowercase or capitals?

Write company names the normal way. Just avoid ALL CAPS and spammy words.

Want all of this done for you?

Save the setup time. Our team finds your buyers, writes the emails, answers every reply and books qualified sales calls into your calendar. Talk to our founder for 20 minutes and you will leave with a plan, whether you work with us or not.

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Case study 05 · Small pilot

103 opportunities from 10,284 people.

A small test before scaling up. About 1 in every 100 people contacted became a real sales opportunity.

10,284People contacted
417Replies
4%Reply rate
103Opportunities
Get a plan like this for my companyFree 20-minute call. No pitch.
10,284 contactedCase 05
10,284
People contacted
↓ 4.1%
417
Replies
↓ 25%
103
Sales opportunities
Pipeline generated$150,000
Campaign dashboard · PilotReal data
Pilot dashboard: 10,284 contacted, 417 replied, 103 opportunities

2–5 sales calls every day. Guaranteed.

Liked this guide? This is a small piece of the system we run for our clients. Book a free 20-minute call and we will show you how it would work for your company.

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