Email advertising template: an offer email is not a newsletter, so it carries one offer, one proof and one action

An advertising email and a newsletter are two different deliverables that happen to use the same tool. A newsletter is a habit: a fixed skeleton, several items, sent on an interval whether or not there is news. An advertising email is sent because one offer exists, and every part of it protects one action. The template below is five parts plus a footer, filled in twice. If what you need is the recurring issue rather than the promotion, the block structure for that is set out in the email newsletter template.

The five parts, in order

Part	Its job	Length
1. Subject line	Name the offer in the words the reader would use, with the number in it	Six to nine words
2. Preheader	Add the condition the subject line left out, never repeat it	Up to about 100 characters
3. The offer block	One offer, with its price, its terms and the date it ends	Two to four lines
4. The proof element	One checkable reason to believe you	One line
5. The action	One instruction, with the link sitting on the instruction itself	One line, repeated once at the end
The footer	Who sent it, from where, and how to stop receiving it	Three lines, identical every send

Parts one, two and the footer are the template and never change shape. Parts three, four and five are the send. A promotional email that runs to nine blocks is a newsletter with a discount buried in it, and the discount is what gets missed.

The subject line and the preheader are one unit

The preheader is the preview text most inboxes show immediately after the subject line, on the same row or the one below it. Two things decide whether it earns its place.

• It carries the second fact, not the first one again. If the subject says what the offer is, the preheader says what it costs, who it is for, or when it ends. A preheader repeating the subject wastes the only other line you get before the email is opened.
• Leaving it empty fills it for you. Mail clients pull the first readable text in the message when no preheader is set, which is usually a view in browser link, a logo alt text, or an address block. Every one of those reads as a mass send before a word of the offer arrives.

Write the pair together and read them as one sentence. Subject: Half price service until 30 November. Preheader: Nine slots left, and it includes the parts.

One offer, and the test it has to pass

Write the offer as a single sentence, including price and terms, before you open the sending tool. If that sentence is hard to write, the email is not the problem and no subject line fixes it. Then run two checks on it.

• The stranger test. Could somebody outside your market repeat the offer back correctly after one read, including what it costs and when it ends? If not, cut words until they can.
• The count test. Count the things you are asking for. Two offers in one email split the attention and both get fewer takers than either would alone. Send the second one next week.

The offer block is also where the terms live, in the same type size as the offer rather than underneath it. A minimum spend, a first order only condition or an excluded range belongs next to the price, because a reader who discovers the condition at the checkout is a reader you have annoyed at your own expense. The same four part discipline applied to search, social, print, radio and SMS is worked through in marketing advertisement samples, which is the page to use when the offer needs to run in more than one place.

The template, ready to copy

Square brackets are the parts you replace.

• Subject: [The offer, with the number in it]
• Preheader: [The condition or the deadline, in plain words]
• First line: [Who this is for, in one clause]. [The offer, stated once.]
• Offer block: [What you get]. [What it costs, or what the saving is]. [The terms that matter]. [Ends on a date.]
• Proof: [One checkable fact: a review count and the platform, a named client, a certification, a year established, a number from your own records].
• Action: [One instruction], with the link on the instruction itself.
• Sign off: [A named person], [role], [company], with a reply address a person reads.
• Footer: You are receiving this because [reason]. [Company legal name], [full postal address]. [Unsubscribe].
• Repeat the action line once, immediately above the footer.

Filled example one: a shop with a dated offer

• Subject: 20 percent off winter coats until Sunday
• Preheader: In store and online, and the new rail is in
• First line: If you have been waiting for the coats to come down, they have. Twenty percent off the whole winter rail until Sunday evening.
• Offer block: Twenty percent off every coat in the winter range. Applies in store and online. One discount per order, and it does not stack with the loyalty voucher. Ends Sunday at closing.
• Proof: A photograph of the actual rail in the shop, with the sizes that are still on it listed underneath.
• Action: Shop the winter rail. Or reply with your size and we will hold one for forty eight hours.
• Sign off: The owner, by name.

Note what the proof is doing. A picture of your own shelf is checkable in a way that a supplier image is not, and a list of remaining sizes is both proof and scarcity that happens to be true.

Filled example two: a service business with a capacity offer

• Subject: Four boiler service slots left in November
• Preheader: $89 fixed, and parts are quoted before we start
• First line: November is nearly full. Four service slots are left, and the price is fixed before anybody touches the boiler.
• Offer block: A full service at $89, booked for a two hour window you choose. Any part needed is quoted and approved by you before the work starts. Covers the ZIP codes we list on the booking page. Four slots, then the next date is January.
• Proof: Our engineer registration number, and the review count on our Google profile with the average.
• Action: Pick a slot on the booking page. It takes two minutes and needs no account.
• Sign off: A named engineer, with a direct mobile number.

A capacity offer is the strongest kind a service business has, because the limit is real and the reader can tell it is real. Four slots that are actually four slots works. A countdown that resets when the email is reopened teaches the reader to discount everything else in it.

The sender and opt out lines, which United States law sets for you

Commercial email to recipients in the United States falls under the CAN-SPAM Act, enforced by the Federal Trade Commission, and a promotional send sits squarely inside it. Four requirements shape the bottom and the top of every offer email.

• The from name, reply address and routing information identify who actually sent it. A reply address that bounces is the version of this that gets noticed.
• The subject line matches what is inside. On an offer email this is the live one: a discount, a figure or a deadline in the subject that the body does not deliver is the clearest violation in the Act.
• A valid physical postal address appears in the message. Your street address, or a post office box or private mailbox that meets the Postal Service rules. This is the line new senders leave out.
• One clear way to opt out, honoured quickly. No fee, no login, no form asking why, and the address moved to a suppression list rather than deleted and later re-imported.

Penalties are set per email and adjusted for inflation, so read the current figure in the Federal Trade Commission's own CAN-SPAM compliance guide rather than in any blog, this one included. Separately, the large mailbox providers set their own conditions for bulk senders, which include authenticating your sending domain and supporting a one click unsubscribe in the message headers. Your sending platform sets those headers, and Google and Yahoo both publish current sender guidelines worth reading before a first large send.

The one number that tells you whether the send worked

Opens stopped being a clean reading when Apple's Mail Privacy Protection began preloading images for Mail users by default in 2021, so the number to build the habit around is the one at the end. Use your own figures rather than anybody's averages.

• Offers taken for every thousand emails delivered. Take the orders or bookings attributable to the send, divide by emails delivered, multiply by a thousand. That figure compared with your last three sends is the only benchmark that describes your list.
• What the send earned after the discount. Orders multiplied by your gross margin on those orders, minus the value of the discount given away. A send that lifts orders and lowers that figure is a price cut wearing a campaign's clothes.
• Unsubscribes for every thousand delivered. A steady low number is health. A spike after an offer send points at frequency or at a segment that never asked for promotions.
• Replies. On a small list the three people who answer tell you more about the offer than the dashboard does. Read those first.

The offer email: six questions that decide the draft

How long should an advertising email be?

Short enough that the action is visible without scrolling on a phone, which in practice is the offer block, one proof line and the instruction. Everything you want to add belongs on the page the instruction links to, where there is room for it and where the reader has already chosen to keep reading.

Can I put two offers in one email?

Put one. Two offers in one send split the decision and both get fewer takers, and the reporting afterwards tells you nothing because you changed two things at once. If both offers matter, send them a week apart and compare the two readings.

What goes in the preheader?

The fact the subject line had no room for, which is usually the price, the deadline or the eligibility. Set it explicitly every time, because an unset preheader is filled by whatever text the mail client finds first in the message.

How often can I send offers to the same list?

Set the interval from your own unsubscribe and reply numbers rather than from a rule. Send, read the unsubscribes for every thousand delivered, and hold the interval that keeps that figure flat. Businesses with genuine new stock or real capacity limits sustain a higher frequency than businesses sending the same discount repeatedly, because there is something new to say each time.

Does a promotional email need a physical address?

Yes. A valid physical postal address in the message is one of the CAN-SPAM requirements, and a registered post office box or private mailbox that meets the Postal Service rules satisfies it for people who work from home.

Should the offer sit in an image?

Put the offer in text and use the image to show the thing. Images are blocked or slow to load for part of every list, and an email whose entire offer lives inside a picture arrives blank for those readers. Real text also renders correctly in a dark theme and can be read aloud by a screen reader.

The description of your offer that you did not write

Everything above assumes the reader is holding your email. There is a second place your offer gets described now, and no sending platform reaches it: somebody asks ChatGPT, Gemini, Perplexity or Claude who to use in your category, and gets back three or four names with a sentence of description each. That sentence is assembled from whatever has been published about you across the web, which means it often quotes an old price, an old range or a service you stopped offering. For a business that writes careful offers to its own list, the gap between the two descriptions is worth a look. AI Knows Us asks those buying questions across the main assistants and records who gets named and what the answers were built from.