5 Cold Email Rules That Actually Get Replies (With Templates)

A good cold email feels like it was written by one human, for one person, with one clear ask. Most fail for the opposite reasons: they're generic, long, and entirely about the sender. The recipient smells the mass-blast in two seconds and deletes it.

The good news is that cold email still works extremely well when you follow a few rules. Here are the five that matter most, with examples.

1. The first line is about them, not you

Never open with "I'm reaching out because we…". The first line decides whether the rest gets read, and nothing kills interest faster than a sentence about you.

Open with something specific to *them* — a recent product launch, a post they wrote, a number from their site, a hire they just made. It proves, instantly, that you're not emailing 500 people.

• *Weak:* "We're a leading provider of onboarding software."
• *Strong:* "Saw you just opened three new support roles — usually a sign onboarding volume is climbing fast."

2. Make one clear ask

Decide the single action you want and ask for exactly that — a 15-minute call, a reply, an intro. Two asks means the reader has to make two decisions, and the easiest decision is to do nothing.

Keep the ask small. You're not asking them to switch tools today; you're asking for a short conversation.

3. Keep it under 120 words

Busy people skim on a phone. Short emails get read and answered; long ones get "I'll deal with it later" (i.e. never). If your email needs scrolling, cut it in half. Every sentence should earn its place.

4. Sell the outcome, not the product

Don't describe what you do — describe what changes for *them*. Features are about you; outcomes are about them.

• *Feature:* "We offer an AI-powered onboarding platform."
• *Outcome:* "We helped a team your size cut new-hire ramp time by 40% in one quarter."

If you have a relevant proof point — a similar company, a concrete result — lead with it.

5. End with a low-friction CTA

The last line should be the easiest possible yes. "Worth a quick 15-minute call next Tuesday?" beats "Let me know what time works across your calendar and I'll send an invite." The less effort your ask requires, the more replies you get.

A simple template that works

Put it all together and you get something like this:

Hi {Name}, > > Saw {specific, recent thing about them}. Usually that means {relevant pain}. > > We helped {similar company} {concrete outcome}. Thought it might be relevant as you {their situation}. > > Worth a quick 15-minute call next week? > > {Your name}

Notice it's four short lines, personal, outcome-led, and ends with one easy ask. That's the whole game.

What actually gets a reply

Cold email performance comes down to a few things, and none of them is the template:

• A subject line that reads like a person wrote it. Three to five words, lowercase is fine, no marketing language. "quick question about your returns page" outperforms "Unlock 30% More Revenue Today".
• Under 120 words. Every extra sentence lowers the odds of a reply. If it needs scrolling on a phone, it is too long.
• One specific observation. Something that proves you looked: a page on their site, a recent launch, a job they posted. This is the whole difference between cold email and spam.
• One ask, and a small one. "Worth a 15-minute call next week?" gets answered. "Let me know your thoughts and availability and whether this is relevant" does not.
• No attachments in the first email. They trip spam filters and nobody opens a file from a stranger.
• Send Tuesday to Thursday morning, in their timezone. Modest effect, but free.

The legal side, briefly

Rules differ by region, and getting this wrong is expensive:

• EU and UK (GDPR/PECR) — business-to-business cold email is generally permissible under legitimate interest, but you must identify yourself, explain how you got their details if asked, and offer an easy opt-out. Emailing private individuals without consent is not allowed.
• US (CAN-SPAM) — cold email is legal, but requires accurate headers, a truthful subject line, a physical postal address, and a working unsubscribe honoured within ten business days.
• Everywhere — no bought lists, no scraped personal addresses, and stop immediately when someone asks you to.

This is a summary, not legal advice. If you are sending at volume, confirm the rules for your market before you scale.

Frequently asked questions

How long should a cold email be?

Under 120 words. Short enough to read on a phone without scrolling. Length is the most common reason a good pitch goes unanswered.

How many follow-ups should I send?

Two or three, spaced three to five days apart, each adding something new. After that, stop — further messages damage the relationship you were trying to build.

What is a realistic reply rate?

For a well-targeted, genuinely personalised campaign, low double digits. For a generic blast, close to nothing. The difference is research, not volume.

Should I use the recipient's first name?

Yes, and nothing else automated. Over-personalised merge fields ("I loved your post about {topic}") are transparent, and they read worse than no personalisation at all.

Is cold email legal?

Business-to-business, generally yes in both the EU and the US, provided you identify yourself and offer an opt-out. Rules are stricter for private individuals. See the section above.

Can AI write cold emails?

It writes the structure well and the specifics badly, because it does not know the recipient. Use it for the draft, then replace the generic observation with a real one. That single sentence is what determines whether you get a reply.

Personalize every one — in seconds

The slow part is writing a genuinely tailored version of this for every prospect. That's what Proself's cold email tool is for: give it the recipient, what you offer, and a detail or two about them, and it writes a personalized, concise, reply-worthy email in seconds — so you can send ten great ones in the time it used to take to write one.