How long should a cold email be?

Between 50 and 120 words works for most B2B outreach. If it needs scrolling on a phone, it is too long.

What makes a good cold email subject line?

Short, lowercase-feeling, and specific to the reader, such as "Rooftop unit at Lakeview Clinic". Avoid all caps, exclamation marks and promises.

Should I include a calendar link in a cold email?

Usually not in the first email. Ask a question first. Offer times or a link once the person shows interest.

Do cold emails need to be personalized?

One true, specific line in the opening is enough. Fully custom emails take too long to send at any volume.

Can AI write cold emails?

Yes, and it works best when you give it a clear description of the buyer and the offer. Review the first batch yourself so it sounds like you.

Cold email

How do I write a cold email that gets replies?

Write to one specific person, say in the first line why you are writing to them, make one small ask, and keep the whole thing under about 100 words. Replies come from relevance and a low-effort next step, not from clever phrasing. If the email could be sent to a thousand people unchanged, it will be treated that way.

Updated October 2026

The five parts, in order

A cold email that works usually has the same five parts, in about 60 to 100 words:

1. A subject line that looks like it came from a person.
2. A first line that shows why this reader, specifically.
3. One sentence on who you are and what you do for people like them.
4. One small ask, phrased as a question.
5. A plain sign-off with a way to opt out.

Everything else is optional, and most of it hurts. Cut your first draft by a third and it is usually better.

Example one: a service business

Fictional sender: Priya Natarajan, who runs Lakeside HVAC Service in Madison. Reader: the facilities manager of a small medical clinic.

Subject: Rooftop unit at Lakeview Clinic Hi Greg, I saw Lakeview Clinic is on Highland Ave, and I look after rooftop heating and cooling for four clinics within a mile of you. Most of them switched to us because their old company took two days to show up. Are you happy with your current response time? If not, I can drop off a quote this week. Priya Natarajan Lakeside HVAC Service, 88 Example St, Madison, WI 53703 Reply "no thanks" and I will not write again.

It names the reader's building, gives a reason that matters to a facilities manager (response time), and asks a yes or no question. Total: about 75 words.

Example two: a software product

Fictional sender: Jonas at Tallybook, a scheduling tool for tutoring centers. Reader: the owner of a tutoring center.

Subject: Rescheduling at Northgate Learning Hi Amira, Tutoring centers tell us the worst part of the week is Sunday night texts about rescheduling. Tallybook lets parents move a session themselves and fills the gap from a waitlist. Would it be useful if I sent a two-minute video of how it works for a center your size? Jonas, Tallybook Reply "stop" to opt out.

The ask is small. A video costs the reader nothing and does not require a meeting. Asking for 30 minutes of a stranger's time in the first email is the most common reason cold emails fail.

What to cut

Skip the company history, the list of features, the line about being "a leading provider", and any sentence that starts "I hope this email finds you well". None of it helps the reader decide. Skip attachments and images in the first email, since they can send it to spam. Skip three links; one is enough, and none is better.

Be careful with compliments about the reader's company unless they are true and specific. A generic "love what you are doing" reads as filler. A detail only someone who looked would know is worth more.

Personalize one line, not the whole email

You do not need to research each person for ten minutes. You need one true detail in the first line: their street, their role, a job posting, a recent opening. That single line signals a person wrote it. The rest of the email can be the same for everyone in the same group, which lets you send to 30 people a day without losing the afternoon.

Group your list so one email fits each group. Property managers get one version and dental offices another. Our guide to <A href="/press/how-to-build-a-lead-list">building a lead list</A> covers how to group people so the message stays specific.

Test one thing at a time

Send 50 emails with one subject line and 50 with another, and compare replies. Do not change the subject, the first line and the ask all at once, or you will not know what worked. After a couple of hundred sends you will know more about your market than any article can tell you. Then write the follow-ups using the same discipline: one new thing each time (see <A href="/answers/how-many-follow-ups-cold-email">how many follow-ups a cold email should get</A>).

Where Rocketship fits

Rocketship finds the buyers by name, writes the first email and the follow-ups, sends them from your own Gmail, and answers replies. By default it does this on its own, and you can review any message you want. It does not guarantee replies, since the message and the list decide that. Plans are on <A href="/pricing">the pricing page</A>: Launch is $24.99 a month with a 7-day free trial, card required (Launch includes no phone number; a line is $5 a month).