Definition
Affiliate marketing in email involves three parties: the merchant who creates the product or service, the affiliate who promotes it to their email list, and the customer who makes a purchase. The affiliate earns a commission — typically a percentage of the sale or a fixed fee per action — for each conversion driven through their unique tracking link.
Email is one of the most effective channels for affiliate marketing because affiliates can build trusted relationships with their subscribers and recommend products with genuine endorsement. Affiliate emails consistently outperform many other promotional channels because they come from a trusted source rather than the merchant directly.
How It Works
- The merchant provides affiliates with a unique tracking link or coupon code
- The affiliate promotes the product to their email list with a personalised recommendation
- Subscribers click through and purchase using the affiliate link
- The merchant tracks the conversion and credits the affiliate with the commission
- The merchant pays the affiliate according to their agreed commission structure
Types of Affiliate Emails
| Type | Description | Best For |
|---|---|---|
| Product Review | Honest assessment of a product the affiliate uses | Building trust and credibility |
| Personal Story | How the product solved a specific problem | Relatable, narrative-driven promotion |
| Curated List | Roundup of recommended tools including affiliate links | Multiple income sources in one email |
| Launch Promotion | Promoting a new product during its launch window | Time-sensitive high commissions |
| Seasonal Recommendation | Holiday gift guides or seasonal picks | Timely relevance |
Best Practices
- Disclose affiliate relationships: FTC and ASA regulations require clear, conspicuous disclosure that you may earn a commission
- Promote what you use: Only recommend products you genuinely believe in — your subscribers trust your judgement
- Add value first: Provide useful information and context, not just a link to buy
- Track everything: Use unique tracking links for each campaign to measure performance
- Segment your list: Send relevant affiliate offers to subscriber segments most likely to be interested
- Respect your list: Do not send excessive affiliate promotions that erode trust and increase unsubscribes
Regulations
Affiliate email marketers must comply with:
- FTC guidelines: Clear disclosure of affiliate relationships
- CAN-SPAM Act: Accurate subject lines, valid physical address, easy unsubscribe
- GDPR / CASL: Valid consent for marketing emails, proper unsubscribe mechanisms
- Platform terms: Amazon Associates and other affiliate programmes have specific email promotion rules
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Related Glossary Terms
A/B Testing
A/B testing in email marketing is the practice of sending two variations of an email to a small sample of your list to determine which version performs better before sending the winner to the remaining subscribers.
Abandoned Cart Email
An abandoned cart email is an automated message sent to customers who added items to their online shopping cart but left without completing the purchase. It is one of the highest-converting email types in ecommerce.
Account-Based Marketing Email
An account-based marketing email is a highly targeted message sent to a specific organisation or decision-maker group as part of a focused B2B strategy.
AI Email Summary
An AI email summary is a short, machine-generated overview of an email's key points, shown by Gmail, Outlook and Apple Mail before a recipient opens the message. It is reshaping how email marketers think about subject lines, preview text and open rates.
AI Inbox Summary
An AI inbox summary is an AI-generated digest that condenses unread email — often highlighting news, actions and senders — changing how clearly your marketing email reaches and engages subscribers.
AI Inbox
An AI inbox is an email client that uses artificial intelligence to summarise, sort, prioritise and sometimes answer emails before the human recipient reads them. It is transforming email marketing metrics and copywriting.
Frequently Asked Questions
Yes. In most jurisdictions, including the US, UK, and EU, you must clearly disclose your affiliate relationship. Common disclosure language: "I may earn a commission if you purchase through this link" placed near the affiliate link or at the top of the email.
Commission rates vary widely by industry. Physical products typically offer 5-15% commission. Digital products and SaaS often offer 20-50% or more. Some programmes offer flat fees per sale or lead rather than percentage-based commissions.
The right frequency depends on your audience and relationship. Most successful affiliate marketers send dedicated promotional emails no more than 1-2 times per month, with occasional mentions in regular content newsletters. The majority of emails should provide value unrelated to affiliate promotions.