Gary Halbert's Rules for Cold Email: The A-Pile, the Starving Crowd, and Letters That Get Read

Gary Halbert died in 2007. He wrote his best work on a typewriter, mailed it via the US Postal Service, and never once opened a cold email sequence in Instantly or Smartlead.

And yet, if you handed him your cold email campaign today, he’d diagnose everything wrong with it in about four minutes.

Halbert was the most successful direct mail copywriter of his era. His “coat of arms” letter alone generated over 600 million pieces of mail over its lifetime. His newsletter, The Gary Halbert Letter, is still circulated in copywriting circles decades after publication. He understood human psychology, attention, and persuasion at a level most people never reach.

His principles don’t need translation. They need application.

The A-pile and the B-pile

This is where everything starts.

Halbert would open every seminar with a question: “When you get your mail, what do you do?”

The answer: you stand over the trash can and sort it. Pile A contains things you’ll actually read. Pile B contains everything else, which goes straight in the bin.

The A-pile has personal letters, bills you have to deal with, things from people you know. The B-pile has every piece of advertising that signals it’s advertising before you’ve read a word.

Cold email has exactly the same dynamic.

Your prospect gets 80 to 200 emails a day. They do the same triage in seconds, based on signals before they’ve read a single sentence. Subject line. Sender name. Preview text. Those three things determine whether your email gets opened or hits the trash.

Most cold email fails before the first word of copy is ever read. Not because the copy is bad. Because the email screamed “advertising” before they got that far.

What puts a cold email in the A-pile:

A sender name that looks like a real person, not a company (“Reeshav from BuyerBrains” not “BuyerBrains Outreach”)
A subject line that reads like something a human sent (“quick question” not “Increasing Revenue by 40% for Companies Like Yours”)
Preview text that continues the human signal (“saw you’re hiring SDRs” not “We help B2B companies scale their…”)

Halbert’s lesson: design the container before you write the content. An envelope that looks like junk mail is junk mail, regardless of what’s inside.

The starving crowd

This is Halbert’s most famous concept, and the most misapplied.

The question he asked: if you could have any advantage in business, what would it be? Better product? More capital? A great team?

His answer: a starving crowd.

A starving crowd is a group of people with an intense, urgent, unsatisfied need, and you have exactly what they need. The product almost doesn’t matter. Sell hot dogs at a stadium when no one else is selling food, and you’ll sell out regardless of how good your hot dogs are.

Applied to cold email, this reframes the targeting question entirely.

Most teams approach targeting as: “Who might be interested in what we sell?” Halbert would ask: “Who is starving for what we provide, and how do we find them?”

The starving crowd is not defined by demographics. It’s defined by urgency and fit. You’re looking for:

Situation signals: companies that just raised a round and are now under pressure to hit pipeline targets
Pain signals: teams that hired three SDRs and then immediately posted a job for an outbound specialist (they’re struggling)
Intent signals: prospects who recently liked or commented on content about outbound challenges
Change signals: a new VP Sales who just came in from a company famous for outbound (they believe in the channel)

The difference between a 2% reply rate and a 12% reply rate is usually not better copy. It’s a better list. Sending the right email to the wrong crowd produces nothing. Sending a mediocre email to the right crowd, people who are actively feeling the problem you solve, produces pipeline.

Most teams spend 80% of their effort on copy and 20% on the list. Halbert would flip it.

Write like a human, not a vendor

The Boron Letters, Halbert’s letters written to his son from a federal prison camp, are the best example of his writing style at full power. They’re raw, direct, personal, funny, and impossible to stop reading.

He wrote the way people actually talk.

Cold email almost never does this. It sounds like an HR department wrote it, approved it through three layers of legal, and then handed it to a robot to send. Every trace of personality has been removed in the name of “professionalism.”

The irony: professional equals forgettable in cold email.

Here’s what Halbert’s style looked like in practice. His letters often opened mid-thought, or with a question, or with something startlingly direct:

“I want to tell you something important, and I want you to read this very carefully.”

“Here’s a question you’ve probably never been asked before…”

“There’s something I’ve been meaning to tell you for a while now.”

These are not clever tricks. They’re devices that signal: a real person wrote this, to you, and they have something specific to say.

Translating this to cold email:

Don’t open with your name and company. Nobody asked. Don’t open with “I hope this finds you well” because it’s filler everyone ignores. Don’t open with a generic compliment because they know it’s fake.

Open mid-thought. Start with the observation. Start with the question. Start with the direct point.

Vendor voice	Halbert voice
”Hi [Name], my name is Alex and I’m the Head of Sales at Outreach Co…"	"Your team’s been growing pretty fast since Q3. Three new AEs in two months."
"I wanted to reach out because I think you might be interested in…"	"One thing we keep seeing with sales teams at your stage…"
"We’re a leading provider of B2B lead generation solutions…"	"We run the cold email program so your AEs don’t have to.”

The left column sounds like a vendor. The right column sounds like a person.

The P.S. always gets read

In direct mail, Halbert knew that people scan letters before they read them. They look at the headline, the images, the subheads, and especially the P.S.

The P.S. is the last thing on the page but often the first thing actually read after the headline. Halbert used it religiously, always putting a critical piece of information or a reinforcement of the core offer there.

Cold email has an equivalent: the final line before your signature.

Most cold emails waste this real estate. After the ask, they sign off and disappear. But the last line you write carries disproportionate weight. It’s what the reader sees right before they decide whether to respond.

Options for the P.S. equivalent in cold email:

The social proof drop: “We just wrapped a 90-day run for a Series A SaaS company. 44 meetings booked. Happy to share what the setup looked like.”
The scarcity note: “Worth knowing we usually have a 2-3 week waitlist, so if timing matters, sooner is better.”
The low-stakes offer: “Either way, happy to give you a quick read on your current deliverability setup at no cost.”

It doesn’t have to be elaborate. It just has to add one more reason to reply.

Give them a reason why

Halbert was a student of Claude Hopkins (more on Hopkins in another post in this series), and one of the most important things he absorbed was the “reason why.”

Whenever you make a claim or an offer, give a reason for it. Not just “reply if interested” but why you’re reaching out now. Not just “book a 15-minute call” but why 15 minutes and not a full demo.

People are more likely to comply with a request when a reason is given, even a simple one. This is well-documented in psychology. Langer’s famous “copying machine” study showed that asking to cut in line with a reason, even a circular one, dramatically increased compliance.

In cold email, the “reason why” shows up in several places:

Why you’re reaching out now (rather than randomly):

“Saw [Company] just raised your Series B. That’s usually when outbound infrastructure becomes a priority.”

Why this matters for them specifically:

“VP Sales teams at your stage typically have the headcount to scale outbound but not the infrastructure to support it. That’s where most of the friction lives.”

Why the ask is what it is:

“15 minutes is genuinely enough to tell whether this makes sense. I don’t do long intro calls.”

Each “reason why” reduces friction. It answers the implicit question the prospect is asking: why should I do this?

On length: short enough to be respected, long enough to sell

Halbert is famous for long-form direct mail letters, some of which ran to 10 or 20 pages. People assume this means “write long.”

That’s the wrong lesson.

His actual position: copy should be as long as it needs to be to close the sale, and not one word longer. His long letters were long because they were selling something complex with a high price point to people who had real doubts to overcome. They earned every page.

Cold email is different. Your prospect hasn’t opted in. They’re busy. You’re interrupting them. And your only job in the first email is to earn a reply, not close a deal.

For cold email, 75 to 125 words is almost always right. You don’t have space to overcome every objection. You don’t need to. Leave them curious enough to respond.

The length question Halbert would actually ask: “Have I given them enough to act on?” If yes, stop. If no, keep writing.

The Halbert cold email checklist

Before you send any sequence, run it through these questions:

Does it look like A-pile before they open it? Sender name, subject line, preview text all signal real person, not vendor.
Is the list a starving crowd? Have you identified a real, urgent signal, not just a broad demographic?
Does the first line sound like a human wrote it to a specific person? Read it out loud. Would you say it to someone’s face?
Is there a reason why? For reaching out, for the offer, for the ask.
Does the P.S. equivalent add something? The last line should do work.
Is it short enough to be read, long enough to sell? When in doubt, cut.

The bottom line

Gary Halbert’s fundamental insight was that marketing is a conversation between a writer and a reader, and it’s the writer’s job to make that conversation worth having. Every device, every technique, every rule exists in service of that.

Cold email that works is cold email that sounds like one specific person wrote it, to one specific person, about something that actually matters to them.

Everything else is junk mail.