What is the format of a sales email?
A sales email has five parts: a short subject, a first line about the reader, one problem, one line on what you do, with proof if you have it, and one question. Everything else is cut. The table shows the job of each part and how many words each one takes in example 1 below.
| Part | Its one job | Words in example 1 | Example 1 uses |
|---|---|---|---|
| Subject | Says what the email is about | 4 | dock schedulers at Leeds |
| First line | Shows why you are writing to this person now | 11 | Saw Acme is hiring two dock schedulers |
| Problem | Names one problem in words they would use | 20 | drivers are queuing at the dock |
| What you do, with proof | One line on how you fix it, and a result or customer if you have one | 18 | carriers book their own slots |
| Ask | One question that takes a word to answer | 10 | Is dock waiting time something you're working on |
| Signature | Your name, company, and for marketing email a postal address and an opt-out line | Not counted | [Your name], Northwind Ltd |
The four body lines add up to 11 + 20 + 18 + 10 = 59 words, inside the 50-to-125-word range from Boomerang's data. In February 2016, Boomerang, which makes an email plug-in, analysed more than 40 million emails its users had asked to be reminded about if no reply came. It found emails of 50 to 125 words all had response rates above 50%, and emails asking 1 to 3 questions were 50% more likely to get a response than emails with none. Emails written at a 3rd-grade reading level got a 36% lift over those at college level.
Read those numbers with care. They cover every kind of email Boomerang users tracked, not just sales email, and the post doesn't define what counted as a response. For a cold first email to a stranger, our guide to how long a cold email should be sets out Lavender's data, which favours going shorter.
Which kind of sales email are you writing?
Pick the format by what the reader already knows about you. The opening and the ask change most; the five parts stay the same. The rows are our judgement; the cold-email ask follows one study.
| You are writing | What they already know | Open with | The ask | Length |
|---|---|---|---|---|
| Cold first email | Nothing about you | A reason you're writing now: a hire, a launch, a post they wrote | Interest: is this on your list? | Shortest; under 75 words |
| Reply to a demo request or sign-up | What they asked for | Thanks, and the exact thing they asked about | Two specific times | As long as needed to answer their question |
| Referral introduction | The person who referred you | The referrer's name and what they said | A small step: shall I send the plan? | Short; the referrer does the persuading |
| Another team at a current customer | Your product, through colleagues | What their colleagues set up and the result they describe | Who owns this, or 20 minutes | Short, with the colleague's name |
The cold-email ask comes from Gong Labs' study of 304,174 emails (data from users of Gong's sales software; published May 2020, updated March 2026), which counted a meeting booked within 10 days as success. Gong found that asking for interest, such as are you interested in learning more, was the highest performing call to action for cold emails, and that a specific day and time worked best once a deal was under way. Gong doesn't say where an inbound demo request falls; we treat a request as interest already shown, so it gets two times.
Sales email examples you can copy
Four sample emails, one for each row. Northwind Ltd is a made-up company selling software that lets carriers book warehouse delivery slots; Acme, Globex, Priya, Sam and Jordan are sample names. Each sign-off is cut to [Your name], Northwind Ltd here; for marketing email, add your postal address and an opt-out line under it, as the sender section below explains.
Example 2 offers two times instead of asking about interest, because Priya has already asked for the demo.
Use example 3 only if Sam really pointed you to Priya, and tell Sam you've written.
Each first line only makes sense for that reader, which is the test for an opener. More opening lines, sorted by situation, are on our cold email opening lines page.
What's a good subject line for a sales email?
Three or four plain words that say what the email is about, taken from the reader's world: their project, their colleague's name or the thing they asked for. Boomerang's 2016 data found 3 to 4 words got the most responses, with response rates falling slowly as words were added.
Accuracy matters as much as length. The FTC's CAN-SPAM compliance guide says the law covers all commercial messages and makes no exception for business-to-business email, and that the subject line must accurately reflect the content of the message. In our view, a subject like quick question on what is really a pitch is the kind of mismatch to avoid. This is a summary, not legal advice; our comparison of GDPR, UK PECR and CAN-SPAM covers the rules by country.
The subject lines in the four examples: dock schedulers at Leeds; Your demo: carrier slots; Sam suggested I write; What Leeds set up. Each names something the reader will recognise. Our 50 cold email subject lines give more.
What is the 60/40 rule in email?
There isn't one 60/40 rule. Instantly's guide to the 60/40 email rule (updated 26 January 2026; Instantly sells cold email software) calls it a content-balance guideline: 60% of your emails give educational or helpful value and 40% include promotional asks. The same guide notes that the term sometimes refers to a 60% text, 40% image ratio in email design, and, in advertising budgets, to Les Binet and Peter Field's recommended split of 60% brand building and 40% activation.
For a sequence, Instantly's version means three value emails and two asks in five steps. Instantly argues this protects sender reputation; that is its argument, and the guide doesn't publish a test of the ratio. For a single sales email, we use a simpler split: most of the words about the reader's situation, and one line about you. In example 1 that is 11 + 20 = 31 words about Acme's hiring and the problem behind it, against 18 on what Northwind does.
What email address should you send sales emails from?
A named person at your company's own domain, such as [email protected], with a display name that is just the person and the company. Google's email sender guidelines set requirements for everyone sending to personal Gmail accounts since 1 February 2024, starting with SPF or DKIM authentication for your sending domains. Its display name guidelines say the display name should identify the sender only: no subject or message content, no recipient's name, and nothing that implies a reply or a thread.
Make sure replies come back to a person. In Outlook's April 2025 requirements for high-volume senders (domains sending more than 5,000 emails a day to consumer Outlook.com, Hotmail and Live addresses), Microsoft recommends that the From or Reply-To address be valid, reflect the true sending domain and be able to receive replies. The FAQ on the same page says that while enforcement first targets large senders, all senders benefit from these best practices.
For marketing email to US recipients, the FTC guide also says you must disclose clearly and conspicuously that your message is an advertisement, that your message must include your valid physical postal address and a clear explanation of how to opt out, and that your opt-out mechanism must be able to process requests for at least 30 days after you send. For UK recipients, regulation 23 of the Privacy and Electronic Communications Regulations bans direct marketing email that disguises or conceals who it is sent for, or that gives no valid address where the recipient can ask you to stop. Neither summary is legal advice. Whether to send from your main domain or a separate one is a separate decision; our guide to choosing a main or secondary domain for cold email weighs it.
Write and test your sales email this week
Pick the row
Decide which of the four situations you are in. It sets your opener and your ask.
Write one line per part
Subject, first line, problem, what you do with proof, one question. If a line does two jobs, split it or cut it.
Count the words
Add up the body lines as in the table above. Cut any line that doesn't do its job.
Check the sender details
Display name is a person and a company, replies reach a person, and, for US marketing email, the email says it is an ad and the signature has your postal address and an opt-out line.
Send two versions
Change one line only, usually the problem or the ask, and send each to a similar group. Compare replies per person emailed after two weeks.
The hardest line to write is the first, because it needs a reason to write now. Siela's Lead Finder looks for that reason, such as someone hiring for the work you automate, changing role or asking how to solve the problem you solve.
Frequently asked questions
What is a good introductory sales email?
One that explains in the first line why you are writing to this person now, names one problem they are likely to have, says in a sentence how you help, and ends with a question they can answer in a word. If someone referred you, the referrer's name goes first. Leave the company history and feature list for the call.
What are some good openers for sales emails?
Openers that could only be written to this reader: a hire they announced, a post they wrote, a colleague who suggested you write, or something they asked for. Skip greetings about hoping the email finds them well and introductions of yourself, which use the most valuable line on something the reader can see from the signature.
What does a good sales pitch look like in an email?
Short and about the reader. The pitch is one sentence on what you do and one piece of proof, placed after the problem so it reads as the answer to it. Put numbers in only if they are real and you can show them. The rest of the email earns the right to that one sentence.
How long should a sales email be?
Long enough to do the five jobs and no longer. Boomerang's 2016 analysis found emails of 50 to 125 words had the highest response rates, across all kinds of email its users tracked. For cold emails to strangers we'd aim near the bottom of that range, since the reader owes you nothing, while a reply to a demo request can run longer if it answers their question.
Should every sales email ask for a meeting?
No. Gong Labs' data on 304,174 emails found that for cold emails, asking about interest outperformed asking for a meeting, while a specific day and time worked best once a deal had started. Ask for the smallest next step the reader can agree to at that stage.
Sources
- Boomerang (Alex Moore): 7 Tips for Getting More Responses to Your Emails (With Data!) (published 12 Feb 2016, checked 4 Nov 2026)
- Gong Labs (Devin Reed): Surprising cold email CTA that increases meeting bookings (published 27 May 2020, updated 6 Mar 2026, checked 4 Nov 2026)
- FTC: CAN-SPAM Act, A Compliance Guide for Business (checked 4 Nov 2026)
- Instantly: The 60/40 Email Rule for High-Engagement Outreach (updated 26 Jan 2026, checked 4 Nov 2026)
- Gmail Help: Email sender guidelines (checked 4 Nov 2026)
- Microsoft Tech Community: Strengthening Email Ecosystem, Outlook's New Requirements for High-Volume Senders (published 2 Apr 2025, updated 30 Apr 2025, checked 4 Nov 2026)
- legislation.gov.uk: The Privacy and Electronic Communications (EC Directive) Regulations 2003, regulation 23 (checked 4 Nov 2026)