Build your email list the right way
Five practical steps to grow your subscriber base while staying on the right side of federal law.
Your email list is one of your most valuable assets. It connects you directly to people who want to hear from you, without depending on social media algorithms or paid ads. But building that list the right way matters more than you might think. Federal law sets strict rules for commercial email, and breaking them can cost thousands of dollars per message. The good news: following the rules is straightforward, and it actually makes your list more valuable.
Key facts
- Federal law treats all commercial email the same way, whether it's to one person or a thousand. A single violation can carry a penalty of up to $53,088.
- The law defines commercial email as any message whose main purpose is to advertise or promote a product, service, or commercial website.
- Email that mixes commercial and transactional content (like an order confirmation with a sales pitch) is treated as commercial if the sales pitch appears first or if the subject line suggests a promotion.
- Transactional messages—order confirmations, account statements, password resets—have fewer requirements, but only if that's truly their main purpose.
Tip 1: Always get permission before you email
Never buy a list or email people who didn't ask for your messages. Build your list from scratch with people who opted in. On your website, at checkout, or in your shop, offer a simple way for customers to sign up. Make it clear what they're signing up for—daily deals, monthly tips, event invitations, whatever it is. This sounds obvious, but it's your legal foundation. People who chose to hear from you are more likely to engage, and you've got proof they said yes.
Tip 2: Be honest about what your email is
The subject line and the opening of your email tell the reader what to expect. If you're sending a promotion, say so. If you're sending an order confirmation, lead with that. The law looks at what a reasonable person would think when they see your subject line. If your subject says "Your Account Update" but the email is really a sales pitch, you've crossed a line. Put your main message first. If you're confirming an order and also promoting a new product, the order confirmation should come first and take up most of the space. The promotion goes at the end as a bonus, not the main event.
Tip 3: Know the difference between transactional and promotional
Transactional emails—order confirmations, receipts, password resets, account statements—have fewer legal requirements. Promotional emails—sales announcements, event invitations, newsletters with offers—have more. The distinction matters because it affects what you must include in every message. A transactional email to a customer saying "Your roof inspection is scheduled for Thursday" is different from a promotional email saying "Book a roof inspection this week and get 10% off." Don't assume that because someone is a customer, every email to them is transactional. Read the email as if you're the customer. What would you think it's about?
Tip 4: Include the basics in every promotional email
Every commercial message must include your real business name and address. It must have a working way for people to contact you. It must include a clear, easy way for people to unsubscribe or ask you to stop emailing them. Don't bury this stuff. Put it at the bottom, but make it obvious. A link that says "Unsubscribe" works. A link that says "Click here to manage your preferences" works. Hiding it or making it hard to find is not just bad practice—it's illegal. When someone clicks unsubscribe, stop sending them emails.
Tip 5: Don't mix messages in ways that confuse the reader
If you're sending one email to multiple businesses, or if you're partnering with another company to send a joint email, decide upfront who the sender is. That person or company is responsible for following the law. If you're forwarding someone else's promotional email and they're paying you or giving you a discount to do it, that changes the legal picture—you may both be responsible. Keep it simple: send emails from your own business about your own products and services. If you want to partner with someone else, talk to them first about who's responsible for compliance.
Tip 6: Test your subject lines and openings
Before you send a promotional email, read the subject line and the first paragraph out loud. Ask yourself: would a customer think this is a sales pitch or a service message? If you're unsure, it's probably a sales pitch, which means it needs all the legal elements. Err on the side of caution. A customer who knows exactly what they're getting is more likely to open it anyway. Honesty builds trust, and trust builds a list that actually converts.
Building an email list takes time, but it pays off. Start small, follow the rules, and focus on people who genuinely want to hear from you. Your list will grow slower than a bought list, but it will be worth far more.
Sources
They did the reporting. The writing and the opinions here are ours.
Questions people ask about this
Can I email someone if they're already a customer?
Yes, but only if the email complies with the law. If you're sending a promotional message to a customer, it must include your business name and address, a way to contact you, and a clear unsubscribe option. If you're confirming an order or providing account information, those transactional messages have fewer requirements.
What happens if I violate the email law?
Each email that breaks the law can result in a penalty of up to $53,088. The penalties add up quickly if you send multiple violations.
Do I need permission to email business customers?
Yes. The law applies to all commercial email, including business-to-business messages. There is no exception for emails between companies. If it's a promotional message, you need to follow all the rules.
What should I put in the unsubscribe option?
A simple link that says "Unsubscribe" or "Stop sending me emails" works. It must be easy to find and actually work. When someone clicks it, you must stop emailing them.
Can I send an email that's partly promotional and partly a receipt?
Yes, but the receipt part must come first and take up most of the message. If the promotional part comes first or the subject line suggests a sale, the entire email is treated as promotional and must follow all the legal requirements.
What counts as a commercial email?
Any email whose main purpose is to advertise or promote a product, service, or commercial website. This includes newsletters with offers, event invitations, sales announcements, and messages promoting content on your business website.
This piece is about CAN-SPAM Act: a compliance guide for business, published by FTC. Go read the original; the opinions here are ours and the reporting is theirs.
