Monetize your newsletter with advertising.

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

A LETTERHEAD GUIDE

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.

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

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.

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.

GET LIVE Free, discounted, or one send.

SOCIAL PROOF Advertisers follow advertisers.

MORE DEMAND Your calendar starts to fill.

RAISE RATES Booked out? Charge more.

Whether it's free ads, a partner program, or a test in one newsletter, the faster you get live and get data, the faster you scale.

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.

Easy money, with a ceiling.

Letterhead plugs into the major programmatic networks (Google Ad Manager, LiveIntent, Revcontent), so you can switch a slot to programmatic fill and keep the rest direct.

ADVANTAGES

• Set it and forget it
• No direct sales required
• Some targeting even for general audiences

WATCH-OUTS

• Lower rates: $0.10–$1.50 CPM
• Quality varies without active blocklists
• Little control over who appears

STRATEGY 02: Advertiser-provided.

You offer ad slots that advertisers fill with their own creative, sold self-service or direct. Most buyers already have assets from web, search, or social to adapt.

Higher rates, without the production.

Letterhead runs self-service and direct-sold workflows: advertisers upload creative, you approve, and everything ships with your sign-off.

ADVANTAGES

• Higher CPMs than programmatic, no production
• Buyers use creative they already have
• Drafting together builds repeat business

WATCH-OUTS

• Mixed performance across creatives
• Support cost: fixing errors, reviewing content

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.

The highest rates, and the most work.

Letterhead's revenue tools let you sell, collect a brief, draft, get sign-off, and schedule native campaigns in one place, skipping the long email threads. Every team underestimates how much native takes to run well, so go in with eyes open.

ADVANTAGES

• Highest CPMs
• Best performance for advertisers
• Best reader experience, in your voice

WATCH-OUTS

• The most work to run well
• You staff creative + client management
• Higher expectations at premium rates

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." The highest billing and the easiest sell to an aligned partner. Hard to sell other inventory in the same send, and it usually means custom production.

AD UNIT: Native ad.

A mini-article about the sponsor, written in your voice with an image. Your highest rates and best performance, because your team makes it fit. Expensive and time-consuming to produce, and it takes real space in the edition.

AD UNIT: Title ad.

A unit at the very top of the send, the whole ad above the fold. Premium placement without giving up the entire edition. Design it carefully so it doesn't push your content below the scroll on a phone.

AD UNIT: Text ad.

A text-only unit set between stories, marked as an ad but styled like the content around it. Least likely to be skipped, and the easiest to produce. The copy has to carry it.

AD UNIT: Sponsored listing.

A paid placement inside a recurring list (events, jobs, real estate), sometimes given bolder styling. Only as valuable as the list it sits in, so it shines when readers love that section.

AD UNIT: Section sponsorship.

A recurring sponsor attached to a section readers return for, week after week. Aligns a partner to the topic they care about. Needs a consistent structure, and selling too many crowds the product.

AD UNIT: And the house ad: promote yourself.

Dedicated space for your own offerings, your paid tiers, products, events, and referral program, so they get attention every send. With an ad manager you corral them in one place instead of pasting them into each edition by hand.

Match the inventory to your newsletter.

As part of onboarding, our team helps you pick the right ad types for your audience and your sales setup. A few principles guide the call.

Six ways to decide.

• Experiment
  Embrace the beta. Try formats and placements, and be open about it. Readers who like you will come along.

• Reflect your tone
  Handcrafted, human newsletter? Native fits. Automated headline feed? Keep ads simple. The ad style follows the content.

• Consider prominence
  Native puts advertisers close to your brand. If that's uncomfortable, advertiser-provided creative keeps a cleaner line.

• Deliver what you can sell
  Pick units you can ship reliably over rates you can't staff yet. You can always add more later.

• Build a product suite
  A ladder from entry to premium lets you close more budgets and gives sellers room to work.

• Design holistically
  Check the scroll on a phone. The best ads feel like they add value, not interrupt. Aim for integration.

The metrics that matter.

CPM
Cost per thousand. The price to reach 1,000 units of attention, like newsletter opens.

eCPM
Effective CPM. Adjusted price per 1,000 real impressions. A $10 CPM at a 20% open rate is a $50 eCPM.

CTR
Clickthrough rate. The share of people who saw an ad and clicked. Advertisers read it as effectiveness.

Sellthrough
The share of your inventory sold in a period. A fully booked newsletter is 100% sellthrough.

Impression
A verified view of an ad, usually logged when a tracking pixel loads on open.

Unique open
Each reader counted once, not every reopen. A truer read on real engagement.

Where to start on rates.

Nominal ad price = CPM × (subscribers ÷ 1,000). A 100,000-subscriber list at a $10 CPM earns $1,000 per placement.

Suggested ranges for launching new offerings. CPM here means cost per thousand subscribers.

Four rules for pricing in the real world.

• Price to fill the calendar.

Set rates that move inventory. Visible demand at a lower price beats empty slots at a higher one. Raising prices later is the good sign.

• The market matters more than the formula.

Growing fast or fully booked? Raise rates. Losing deals on cost? Lower them. The formula is a starting point, not a law.

• Match the price to the psychology.

A job listing should be a self-service, easy yes. A native sponsorship should require consideration, because you want a partner who'll invest over months.

• Add value instead of discounting.

Asked for a discount? Offer eight native ads for the price of four, not a lower rate. Same cost per ad, more value, and your pricing holds.

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, and generate sponsor reports in seconds. Production, audience intelligence, and agentic operations come with it, on top of the ESP you already use.

Ready to turn attention into revenue?

+22% revenue

Average lift on monetized newsletters after 180 days on Letterhead.

Direct, self-service & programmatic

Every kind of demand in one inventory.

Sponsor reports in seconds

Proof-of-publication without the manual work.

Every send monetized

Automated placement across one newsletter or hundreds.