The newsletter media kit sponsors actually read

Most newsletter media kit advice is about layout: which template, which typeface, what goes on the cover. None of that decides the booking. A newsletter media kit is not a design exercise. It is the document that has to survive the checks a sponsor runs before spending money, and those checks are the same short list nearly every time.

A newsletter media kit is a single page telling a sponsor what your newsletter is, who reads it, what is for sale, at what price, and under what rules.

We wrote those checks down for the other side of the table: how sponsors vet a newsletter before they book. Here is the same list from this side, turned into a document, with the nine-section template at the end. Every check answered in writing is a round trip you do not have, and round trips are where sponsorships stall.

Start with a one-line description of the newsletter

A sponsor needs to place you before they scroll. What it is, for whom, how often:

A briefing on procurement and supply chain for operations leads at UK manufacturers. Every Tuesday.

That is a sorting instruction, not a tagline, and a fast no saves you the follow-up. The mission statement fails: "we help curious people make sense of a changing world" gives a buyer nothing to act on. If your one-liner would fit four other newsletters, rewrite it.

Which subscriber numbers to put in the media kit

The first check is whether your subscriber number has a date on it. Say the list is 48,000. "48,000 subscribers" is a claim; "48,000 subscribers as of 1 March 2026" is a fact.

Subscribers is a database count; what a sponsor buys is an audience. Give both, and lead with:

• Average delivered per issue, across a named window of recent issues. Delivered, not sent, and worth knowing your platform counts delivered as accepted by the receiving server, spam folder included.
• Subscribers, with the as-of date.
• Cadence, and whether you have kept it.

Leading with delivered volume feels like underselling. It is not: it shows you know the difference between the two.

What to say about open rate

Since Apple's Mail Privacy Protection began pre-loading tracking pixels, a share of every recorded open is a machine rather than a reader. How large a share depends on how Apple-heavy your list is, which varies by audience, so open rates no longer compare between newsletters or against your own numbers from a few years ago. A big one at the top of a kit signals you either do not know this or hope the buyer does not. Quote it if you like, caveat it, and move down the funnel.

How many clicks a placement gets

Give clicks in absolute numbers. A percentage makes the sponsor multiply by a denominator they have to trust; an absolute number lets them do arithmetic they can act on. Divide your rate by the clicks and they have a cost per visitor to set against every other channel they buy. Percentages also flatter small lists: to use an illustrative case with invented figures, a 2.5% click rate on a list delivering 1,600 copies is forty people.

Give a range rather than an average, across a named number of recent placements. Including the bad one makes the good one believable.

Then say the thing the sponsor would otherwise find out alone: platform-reported clicks include link scanners. Corporate security gateways follow every URL in a message, most noticeably on business lists, so the sponsor's analytics will read lower than yours. Quote clicks from the sponsor's tracked link where you have it, and name the source of whichever number you print.

How you built your subscriber list

Sponsors ask, and it is easy to answer badly. Three sources, and you almost certainly have a mix: earned (search, word of mouth, referrals), bought (paid acquisition, swap networks, co-registration) and bundled (giveaways, lead magnets, a checkbox on an unrelated form). Write the mix down honestly, roughly, in a sentence, and pair it with engagement evidence. A partly bought list is not a problem; a partly bought list presented as organic is, because a sponsor who works it out mid-campaign stops believing the rest of the document.

Audience demographics without survey data

This is where kits invent things. "68% are senior decision-makers" is the kind of line that gets printed without a survey behind it, and experienced buyers read it as decoration.

State what you can observe:

• Where sign-ups come from, including the posts or partners driving them.
• Geography from click data, not opens. Open-derived location is relayed through the same privacy proxy that broke open rate.
• The share of your list on company domains rather than gmail and outlook. It is the one composition figure a B2B buyer wants that needs no survey.
• Which topics take the most clicks, which is evidence of what readers care about.
• Replies you can quote, with permission.

Do not state, unless you asked: seniority, income, purchase intent, budget authority, company size, or anything with a decimal place that arrived by vibes. If you surveyed readers, cite the question, the sample and the date. Where you infer, say so.

Past sponsors and repeat bookings

The section that does most work for a buyer, and the one kits most often leave out. List previous sponsors with dates and mark the ones who ran more than once. Repeat bookings are among the hardest things here to fake: a first booking says your kit was persuasive, a third says a sponsor checked their own numbers and kept paying.

A buyer can reconstruct most of it from your public archive anyway, so leaving it out only looks like concealment. Bellwether Intel builds that view from public issues and is free with an account: it records that a sponsor ran in a newsletter, on a date, in a category, across the newsletters we monitor. It does not know what anyone paid.

No sponsors yet? Say so. "Introductory rate, first three placements, then the card rate" beats an empty section, and time-boxing it stops the introductory rate becoming the rate.

Ad placements, creative specs and sponsorship terms

A sponsor needs to know what they are buying and what sits next to it.

• How many placements run in one issue, and where theirs sits. One has the page to itself; six is a small ads column.
• The creative spec: dimensions, character counts, file limits, and the copy deadline relative to the send date.
• Who writes the words. Name which you do: run sponsor copy verbatim, edit it to house style, or write it from a brief. Say how many revision rounds are included, and that you will not print a claim you cannot stand behind.
• Approval: you read every placement and can decline a sponsor or a creative.
• Category exclusivity, if you offer it, and for how long.
• If a send slips: moved, credited or refunded. In writing, that is the difference between an inconvenience and an argument.
• Archive and links: whether the placement stays in your public archive permanently, and your policy on the sponsor's tracking links and UTMs. Permanent archiving is worth money and most operators give it away unmentioned.
• Reporting and payment: what you send afterwards and when, plus your terms. Payment before the send, or half up front on a multi-issue run, is normal, and you are allowed to ask.

Then link two or three recent issues as they went out, whole issues rather than screenshots of the slot. Cheapest credibility in the kit.

What to do if your subscriber count is small

Put it in anyway, next to the thing that makes it worth more.

Buyers do not price a list by size alone. They price by how hard the audience is to reach elsewhere, which is why a small, precisely defined list can be worth more per reader than a big vague one. A sponsor selling veterinary practice software struggles to reach practice managers reliably through a social ad auction; if your four thousand readers are practice managers, you sell what the auction cannot. Say who they are, and what one of them is worth to a buyer like this. A sponsor will assume the figure you left out is worse than the ones you printed.

Should you publish your rates in the media kit?

Usually yes. It saves you the opening act of every sale: the enquiry, the wait, the reply that turns out to be a fifth of their budget.

The cost is real, so handle it. A printed number is a ceiling: nobody with a bigger budget pays above it, and an agency opens below it. So publish a card rate you would genuinely accept today, put multi-issue terms on the page so the discount is yours to offer rather than theirs to demand, and re-price on a fixed cadence so the number never becomes an anchor from last year. Arriving at the figures is covered in how to price a newsletter placement.

Break rates out by placement rather than one price for "sponsoring the newsletter", and give availability or a lead time. Anything beats "contact us for rates", which reads as "the price depends on what we think you have".

Media kit format: send a link, not a PDF

A PDF is a snapshot, and your numbers move every week. A page at a stable URL fixes that: you update once, every link anyone has sent stays correct, and it can live in your footer and signature so enquiries arrive informed.

Buyers with a procurement or client-approval step will still want something they can attach and forward, and refusing costs bookings. Keep the page canonical and generate the PDF from it on the day they ask, with that date on it and the URL on every page.

Do not gate the page behind a form. A buyer deciding whether to talk to you at all will often close the tab rather than hand over an email address to see rates.

What to leave out of a newsletter media kit

The kit that fails hardest is all design and no evidence: full-bleed photograph, subscriber count at 96pt, three logos under "as seen in", and not one dated number, click figure, past sponsor or line of policy in it. A plain page that can be checked beats a beautiful one that cannot. So cut:

• Stock photography of people at laptops, and your founder story
• Any explanation of why newsletter advertising works. The buyer is sold on the channel; that is why they are reading.
• Open rate as the headline number
• Emails sent all-time, social followers you are not selling, or any figure that does not correspond to something purchasable
• Percentages about your audience that you did not measure
• "As featured in" logos that are press mentions rather than sponsors
• Any rate you would not accept today

A newsletter media kit template: the nine sections

In the order a buyer reads them.

One thing sits outside the list: a "last updated" date. It tells a buyer the numbers are live rather than eighteen months old, and without it every figure above reverts to being a claim.

For where each section lands in a live deal, the anatomy of a newsletter sponsorship walks the sequence and marks where bookings quietly die.

If you would rather not maintain it by hand

All of this can live on a page you build and update yourself, and plenty of good operators do exactly that. The alternative is a SponsorSheep listing: the same structure, with each placement as its own product carrying its own spec and rate, availability that reflects what is sold, and a sponsor history that fills itself in as bookings happen. It sits where sponsors browsing for newsletters can find it without you sending anything. Listing is free, and we take a commission only when a booking happens.

Either way, the document does one job: it answers the checks before they are asked.