A newsletter reader signed up for a point of view, not your product catalog. Before treating a Substack writer as an affiliate prospect, read the publication and ask whether your product helps answer a question its readers actually have. Then check the platform rules. A commercially attractive idea can still be a poor fit for the publication or its host.
Read the current rules before planning a promotion
Substack's Content Guidelines, updated September 29, 2026, say it does not permit publications whose primary purpose is advertising external products or services, driving traffic to third-party sites, distributing promotions or similar activity. Its older affiliate-link help page says it does not build additional functionality to support affiliate links or advertising. Those statements do not give blanket clearance for an affiliate-led newsletter. Read the current guidelines and resolve questions about the specific publication before committing to a placement.
Make the editorial fit concrete
Imagine a fictional newsletter about maintaining a small balcony garden. A program manager thinks a compact watering can might fit an upcoming article about keeping seedlings alive during a busy week. The useful brief explains capacity, dimensions, price, delivery limits and where the writer can verify those details. It leaves the writer free to decide whether the product belongs in the article. This is an illustrative pitch-planning example, not a recommendation of a particular product or a claim that Substack has approved the arrangement.
The manager should not supply a first-person account of using the watering can for the writer to copy. Personal experience belongs to the person who actually had it. If a product has not been used, the piece can accurately describe documented specifications and say what remains untested. A commission disclosure should be clear alongside the recommendation, using the guidance applicable to the audience and placement. Payment should never depend on hiding the relationship or making a favorable claim the writer can't support.
Separate readership from commercial evidence
A paid subscription is evidence that someone values a publication enough to pay for it. It does not establish that the reader intends to buy a gardening product. Ask for relevant, voluntarily shared aggregate information when it is needed to evaluate a proposal, such as the topic and audience geography. Don't require subscriber identities or access to the writer's account. A large total subscriber number can be less informative than whether the planned article reaches people who can use and receive the product.
If a placement is permitted and agreed, use an affiliate link and destination authorized by the program. Verify what reporting is actually available for that placement. Don't assume a newsletter host guarantees that a merchant's tracking works, or that a click in an email identifies a particular subscriber. Native newsletter referrals and merchant purchase commissions should not be treated as the same arrangement.
Price the work using your own economics
For fictional arithmetic, suppose a permitted placement has an agreed $100 production fee and generates $300 in approved commissionable sales at 10%. The fee plus $30 commission totals $130 before other costs. That is not a market rate, an earnings forecast or evidence of incremental sales. Check the margin and what the fee actually purchases, such as an agreed placement, rather than guaranteeing sales the writer cannot control.
Start with the publication's editorial purpose, then confirm the terms and define what a useful result would look like. The earlier article's audience total, 3.2-times earnings-per-click claim, long-tail click duration and universal commission ranges lacked verified support for this review and have been removed. A defensible partnership proposal needs evidence from the particular publication and program.