How long should a cold email be?

Aim for 50 to 100 words. Gong reports that reply rates drop sharply once a cold email exceeds 100 words and that the best emails land between 50 and 100. Instantly says elite campaigns average under 80 words in the first touch. Length is a proxy for focus: one reason to write, one question, nothing else.

The sources agree on the direction and disagree on the exact number. This post says what each one measured, gives a word count by purpose, and sets out a structure. We opened each source on 19 October 2026.

What do the studies say about cold email length?

Two honest observations. The strongest sources on body length are Gong (an analysis of real executive sales cycles) and Instantly (platform data), and both land under 100 words. The other three give the same advice without data, so they confirm the habit rather than the finding. Do not count five sources as five studies.

Gong also reports that C-level executives are 30.2% less likely to reply to cold emails than non-executives, and that executives who open an email typically read it for no more than nine seconds. Nine seconds is not long, which is a reason to put the point in the first sentence.

What word count suits each kind of message?

This table is our guidance. It combines the Gong and Instantly ranges with how our own studies were written. It is not a measured result.

The survey row is the exception that proves the rule. In the Shelly installer programme the agent put four numbered questions in the body of the email, with nothing to click. 172 of the 210 complete surveys came back in one message. The length was set by the number of things the agent needed to ask.

What structure works at 50 to 100 words?

Five parts, one sentence each, in this order.

1. Why you. One clause showing you wrote to this person on purpose: their role, a company fact, something they said.
2. Who we are. One line. Not a history.
3. One offer. One thing you can do or know, with one specific.
4. One question. A question that can be answered in a sentence.
5. An easy out. Say no, or point to the right person.

An illustration written for this post (not a customer message):

Hi Marta, I saw your team added a second warehouse in Plovdiv this spring. We help distributors cut the time between a customer order and a confirmed delivery slot. If your dispatchers still do this by phone, I can send a two line summary of how others did it. Is it you who looks after dispatch, or someone else?

That is 60 words. It names a reason, makes one offer, asks one question and allows a referral. The hotel letters in our own case study work the same way: who we are (Hotel Pirin in Bansko, about two hours from Sofia), one offer (half board and spa, and a free conference room for groups), a personal line or a template, and one question: reply with your dates and headcount. Three to six sentences. See the Hotel Pirin case study, a related party, which makes no claim that length caused its results.

What should you cut?

• The throat clearing opener. "I hope this finds you well" spends your nine seconds.
• Your company history. One line is enough.
• A list of features. Gong notes that emails filled with buzzwords and vague ROI claims significantly reduce reply rates, without giving a figure.
• Two questions. The reader answers one or neither. Pick the one that matters.
• A calendar link in the first email. A link asks for time. A question asks for a sentence. In the Shelly programme the booking link appeared only after the installer had answered, as one optional line, and 9 of the 17 booked calls came from that line.
• The bump. "Just checking in" adds no information. Woodpecker's roundup attributes to Saleshandy the claim that the phrase reduces meetings booked by 14%. We did not check the original, so treat the figure as unconfirmed.

What about AI written emails?

Length is easy to control with an AI writer. The harder part is that every email sounds the same. What Sellinger enforces here is about control, not style: a campaign can run in approval mode, where every message waits for a person to approve it, or send automatically, and a person can take over any conversation. The agent stops on its own when it cannot answer, for example a price it has no answer for. Sellinger does not publish a list of banned phrases for its writing, and we do not claim a style guarantee. The practical rule is the one above: read the first email as the recipient would, in nine seconds, and approve it only if you can state its single question aloud.

A checklist before you send

• [ ] The email is under 100 words, or the reason it is longer is on the page (for example, numbered questions).
• [ ] The first sentence says why you are writing to this person.
• [ ] There is one offer and one question.
• [ ] The question can be answered in one sentence.
• [ ] There is an easy way to say no or to name someone else.
• [ ] There is no link you do not need.
• [ ] The follow ups are shorter and each adds something new.
• [ ] The subject line is short and plain. Backlinko and lemlist both point to 36 to 50 characters.

Length is not a goal. A 40 word email with the wrong list loses to a 90 word email with the right one. For the conditions under which cold email works at all, see does cold email still work, and for what to write after the first email, see follow up copy that worked and failed. Delivery rules sit in what Google and Yahoo require.