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Think about the mail that shows up at your house. Bills. Magazines. Flyers. More bills.

When you pick up a pile of it, you sort the whole stack in seconds without reading a single word, because each kind is printed differently and arrives differently. Same goes for email: the three kinds in your inbox are built differently, and once you know the tells you can sort them just as fast.

📬 The Three Kinds of Email

Marketing and transactional email look like siblings because they are. Different purpose, near-identical construction.

Cold email is the odd one out, and the way to spot it is to look at what's missing. No images. No fonts. No buttons. No logo. Just text.

Then look at the domain it came from. It will be close to a real company name without being that company's actual website. Type it into a browser and nothing real loads, because that domain was bought for one job: sending this email.

🔤 Why Cold Email Is Plain Text

Plain text is not a style choice. It's a deliverability choice.

A common way of phishing is hiding malicious links inside HTML, so email providers now trust plain text more, because there's less room to hide anything in it.

🎯 What Cold Outbound Actually Means

Cold outbound means emailing people who have never heard of you and never opted in to hear from you, and doing it at real volume: tens of thousands of messages a month.

The volume isn't ambition, it's arithmetic. The person who needs what you're selling this quarter is a small slice of everyone you can reach, so you have to reach a lot of people to find them.

Those two facts, no relationship and high volume, are why the infrastructure is different:

• Marketing email goes from your primary domain to people who asked to be notified
• Cold email goes from domains you bought specifically to send cold outbound, at about 20 emails a day per inbox, in plain text

🚧 What Cold Outbound Is Not

Two things get confused with this, and neither is what the Sequencer is for.

• Inbound, or speed to lead. Someone filled out a form and is expecting to hear from you. Speed is the whole game. That's a different job.
• Rep outbound. A named account gets a message an AE wrote themselves, from their own address, a handful a day. The Sequencer is not built to be that tool.

That second one gets misread: reps are not cut out of this process.

Your reps can absolutely end up inside these conversations, and the setup that makes it work starts at the very beginning. When ops buys the sending inboxes, they put the reps' real names on them and assign each inbox to the rep it belongs to.

So a prospect gets an email from a name that belongs to an actual person at your company. When that prospect writes back, the reply routes to that rep, and the real human takes the conversation over from there. Clay can even draft the response, and the rep approves it in Slack.

Ops owns the sending, at volume, on infrastructure ops maintains. The rep owns the conversation.

👤 Who Owns This

Cold outbound needs an owner: someone who watches the analytics, keeps the segments honest, and notices when a domain starts going bad so they can rotate in a different domain and a different inbox.

That person usually sits in ops, demand gen, or growth.

🚀 What's Next

You can now identify cold email on sight, say what makes it structurally different from every other message in an inbox, and name who in a company owns it.

Next, we get into the infrastructure that cold outbound runs on, starting with deliverability: what actually decides whether your email lands.

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