Monetize your newsletter with advertising.

A list of 500 engaged readers can out-earn someone’s 500,000 — if you sell it right. The free playbook behind $5M+ in newsletter ads sold building WhereBy.Us: three ways to sell, seven ad units, real CPM benchmarks.

• Three ways to sell: programmatic, advertiser-provided, and native
• Seven ad units that work — and when to use each
• Real CPM benchmarks and a pricing formula
• How to fill the calendar, then raise your rates

The white paper

Read the whole playbook, right here.

All 28 pages, no form in the way. Scroll through below, download the PDF, or take it full screen.

Monetize your newsletter with advertising.

How to design, price, and sell the inventory your audience is worth.

THE OPPORTUNITY

You own the most valuable thing in advertising: attention.

A reader's inbox is direct, undivided attention, and you control the data behind it. No third parties, no algorithm deciding who sees you. theSkimm, Morning Brew, and The Hustle turned that into businesses worth tens of millions, and The New York Times built whole product lines on its lists. At Letterhead we've helped hundreds of publishers traffic millions of dollars in newsletter ads, and our founders sold more than $5M of it building WhereBy.Us. This guide is the playbook.

FIRST PRINCIPLE

Your community is the product, not your impressions.

Twenty years of digital advertising trained publishers to count impressions first. A newsletter of 500 engaged readers who are all CMOs can be worth more than 500,000 anonymous addresses, because the niche is well defined and advertisers will pay to reach it. How you position the audience decides everything: treat it like impressions and advertisers will too.

IMPRESSION THINKING

What the old playbook rewards

• Volume above all
• Anonymous reach
• A race to the lowest CPM
• Ads that interrupt the read

COMMUNITY THINKING

How the best newsletters sell

• A known, valued audience
• A well-defined niche
• Premium rates for real attention
• Ads that fit the reader's experience

FIRST PRINCIPLE

You control more of the outcome than you think.

How much you earn isn't subscribers times CPM. It's a set of choices you make.

WHO YOUR AUDIENCE IS

A specific, valuable reader commands rates a general list never will. Know who you actually reach.

WHAT YOU SELL

Programmatic, advertiser-provided, or native: the inventory type you choose sets your ceiling.

HOW YOU POSITION

Sell a community and its results, not a number of sends. Advertisers follow your framing.

HOW YOU WORK WITH BUYERS

Click rates, the metrics they care about, and how you treat repeat spenders all compound.

FIRST PRINCIPLE

Revenue is an accelerating cycle.

Newsletter monetization has a cold-start problem. The hardest part is going from zero. Once you're moving, each step makes the next one easier.

STRATEGIES

Three ways to sell, from set-and-forget to bespoke.

Every publisher needs a strategy tailored to their audience, market, team, and goals. Larger operations run all three across different lists and verticals. Start with what you can deliver, and add as you grow.

STRATEGY 01

Programmatic advertising.

Automated ads filled by a demand partner. You drop a block of code in your template, and image ads load per reader, with limited, privacy-safe targeting.

STRATEGY 02

Advertiser-provided.

You offer ad slots that advertisers fill with their own creative, sold self-service or direct.

STRATEGY 03

Customized / native.

Your team produces the ad in your voice, the way Morning Brew and theSkimm do. Often a short, article-style unit with an image, made to fit the newsletter.

AD UNITS

Seven units that work.

There are as many ad types as there are newsletters. These seven perform consistently for both publishers and advertisers, and they're easy to set up, sell, and grow. Every one is possible with Letterhead's defaults, and you can customize character counts, image sizes, and more.

AD UNIT: Newsletter sponsorship.

One advertiser presents the whole edition, with language like “presented by.”

AD UNIT: Native ad.

A mini-article about the sponsor, written in your voice with an image.

AD UNIT: Title ad.

A unit at the very top of the send, the whole ad above the fold.

AD UNIT: Text ad.

A text-only unit set between stories, marked as an ad but styled like the content around it.

AD UNIT: Sponsored listing.

A paid placement inside a recurring list (events, jobs, real estate), sometimes given bolder styling.

AD UNIT: Section sponsorship.

A recurring sponsor attached to a section readers return for, week after week.

PRICING

The metrics that matter.

• CPM: Cost per thousand.
• eCPM: Effective CPM.
• CTR: Clickthrough rate.
• Sellthrough: The share of your inventory sold in a period.
• Impression: A verified view of an ad.
• Unique open: Each reader counted once, not every reopen.

PRICING

Nominal ad price = CPM × (subscribers ÷ 1,000).

MEET LETTERHEAD

Letterhead runs your revenue operation for you.

Direct-sold, self-service, and programmatic ads in one place: design your inventory, place and track every ad automatically across one newsletter or hundreds.

Ready to turn attention into revenue?

Average lift on monetized newsletters after 180 days on Letterhead: +22% revenue.

Direct, self-service & programmatic — every kind of demand in one inventory.

Every placement, every campaign, every sponsor in one dashboard.