THE COMPLETE GUIDE
Email marketing in the United States, explained in plain English
Here's what the law actually requires, how to build a list people want to be on, and how to send a first campaign that lands in the inbox. No jargon, no scare tactics, just the steps in order.
Covers the CAN-SPAM Act in plain terms
Real steps for building your list the right way
Written for business owners, not lawyers
WHERE TO START
What's inside this guide
Read start to finish or jump to the chapter you need. Each one stands on its own, and together they cover everything you need to send legally, land in the inbox, and grow a list worth having.
The basics: what email marketing is and why it still works
The rules: the CAN-SPAM Act in plain English
Building your list the right way
Campaigns that work, and when to send them
Landing in the inbox: deliverability explained
Measuring what matters: reading your results honestly
Your checklist: what to do this week
Questions people ask about email marketing in the US
START HERE
What email marketing actually is
Email marketing is sending messages to people who gave you their address, on purpose, because they want to hear from you. That's the whole idea. It covers a weekly newsletter to your customers, a sale announcement to your online store's list, a receipt after a booking, and a reminder to someone who left a form half-filled. All of it runs on the same principle: you earned the address, so you earn the attention that comes with it.
It works for a simple reason: you own the list. A social post reaches whoever the platform decides to show it to, on a schedule the platform decides. An email reaches an inbox you don't pay to appear in, whenever you choose to send it. If a platform changes its algorithm tomorrow, your email list doesn't care. It's still yours.
Most small businesses send three kinds of email. Marketing email promotes something: a sale, a new product, a seasonal offer. Newsletters keep the relationship going between sales: what's new, what you're working on, something useful you learned. Transactional email confirms something the recipient did: a purchase, a booking, a password reset. The rules in the next chapter apply a little differently to each, and we'll point out where.
You don't need a big list to start. A hundred people who asked to hear from you and actually open your emails will outperform ten thousand who didn't ask and don't. The rest of this guide is about building that first kind of list, sending to it responsibly, and reading your results without fooling yourself.
KNOW THE RULES
The law behind every send
In the United States, commercial email is governed by the CAN-SPAM Act, enforced by the Federal Trade Commission (FTC). It applies to any email whose main purpose is advertising or promoting a product or service, including the ones you send to your own customer list. It does not require someone to opt in before you can email them, which surprises people, but it sets out firm rules for how you do it.
Your header information has to be accurate. The 'From,' 'To' and routing information must identify the real sender, and the domain and address you send from must be genuine, not disguised or misleading. The subject line can't lie about what's inside: a subject that says 'Your refund is ready' had better lead to a refund, not a sales pitch.
You have to identify the message as an ad if it is one, and you have to include a valid physical postal address: a street address, a registered P.O. box, or a commercial mail receiving agency address. Every commercial email needs a clear, easy way to opt out of future messages, explained in plain language, that doesn't require a login or a fee or more than one step.
Once someone opts out, you have ten business days to honor it, and you can't sell or transfer their address to anyone else after they do. That's the federal floor: honest headers, an honest subject line, a real address, and a working opt-out, honored on time. Some states layer on additional rules for specific industries, so check anything sector-specific that applies to you.
None of this is legal advice, and this guide isn't a substitute for talking to a lawyer about your specific business. What it gives you is the plain-English version of what the FTC expects, so you can build good habits from day one instead of fixing them after a complaint.
GROW IT RIGHT
Building your list the right way
The best list is made of people who asked to be on it. That means a sign-up form, not a scraped spreadsheet or a list you bought. People who opted in open more, click more, and complain less, and every address you add this way is one you can defend if anyone ever asks where it came from.
Put a sign-up form wherever people already are: your homepage, your checkout page, the bottom of your blog posts, your social bio link. If you don't have a website yet, a standalone landing page does the same job: a short form with a reason to join, nothing else competing for attention.
If you're bringing contacts from somewhere else, like a spreadsheet of past customers, import them and check every address against its actual mail server before you send to it, not just for a typo. Dead mailboxes and dead domains drag your sending reputation down even when you did nothing else wrong, and a clean import is worth the extra minute.
Then keep the list honest as it grows. Segment the people who clicked a campaign from the people who ignored it, so your most engaged readers get more of what works and the quiet ones get a reason to come back, not just more of the same.
SEND SOMETHING WORTH OPENING
Campaigns that work
Not every email is a sales pitch, and your list will tell you fast if you treat it like one. A healthy sending calendar mixes a few kinds of message, each with its own job and its own best moment to land.
Here's the lineup most small businesses and creators settle into once they find their rhythm:
Welcome email — the moment someone joins your list, while they're paying attention
Newsletter — weekly or monthly, to stay in the inbox between sales
Promotional campaign — a sale, a launch or a seasonal offer, to your whole list or a segment
Abandoned cart or inquiry follow-up — sent within a day, while the interest is still warm
Re-engagement email — to people who haven't opened in a while, with a reason to come back
Transactional email — receipts, confirmations and reminders, sent the moment they're triggered
Event or seasonal invite — for a workshop, webinar, open house or holiday hours
Feedback or survey email — after a purchase or service, while the experience is fresh
REACH THE INBOX
Landing in the inbox, not the spam folder
Deliverability is simply whether your email reaches the inbox at all. You can write the best subject line in the world and it won't matter if the message never gets past the spam filter. Three things decide it: who you're sending from, how fast you're sending, and who you're sending to.
Who you're sending from starts with authentication: SPF, DKIM and DMARC, three records that prove to Gmail, Microsoft and Yahoo that the email claiming to be from your domain is actually from your domain. Six and Two registers and authenticates your sending domain for you, so there's no DNS record to find or copy.
How fast you're sending matters more than people expect. A brand-new domain that sends a huge batch on day one looks exactly like a spammer to an inbox provider, even if every address is genuine. A domain earns trust gradually, sending a measured volume and growing it as each provider accepts its mail, with its own pace for Gmail, Microsoft and the rest, adjusted to how they're responding right now.
Who you're sending to is the part you control most directly: a clean, verified list. Every address gets checked against its mail server before it enters a campaign, so dead mailboxes and bounced domains never drag your sending reputation down in the first place.
Put those three together and the numbers back it up: mail sent across the Six and Two network delivers at 99.7%. That's not a promise about your specific results, it's what a properly authenticated, properly paced, properly verified send looks like at scale.
READ IT HONESTLY
Measuring what actually matters
Once your campaign sends, the report tells you what happened, but only if you know what you're looking at. The number that gets the most attention, open rate, is also the easiest to misread.
A growing share of 'opens' aren't a person reading your email at all. Phone and mail apps now open messages automatically to scan them for threats, and platforms that don't separate those out count every one as an open. That inflates the number and tells you nothing about whether anyone actually saw your offer. Six and Two reports human opens and automated opens in separate columns, so the number you look at is the number of people, not software.
Clicks are a more honest signal: nobody clicks a link by accident. Watch clicks against delivered emails, not against opens, and watch them over a few sends rather than one, since a single strong subject line can flatter a single campaign's numbers without meaning much.
Bounces, complaints and unsubscribes matter just as much as the positive numbers. A rising bounce rate usually means your list needs a fresh verification pass. A rising complaint rate means the content or the frequency has drifted from what people signed up for. Both are easier to fix the week they start than the month they've compounded.
THIS WEEK
Your email marketing checklist
Choose a sending domain that matches your brand
Get SPF, DKIM and DMARC set up and authenticated
Write your opt-out process and a one-line privacy note
Add a sign-up form to your homepage and checkout page
Import your existing contacts and verify every address
Draft a welcome email for new subscribers
Design your first campaign in your brand's colors
Add your physical address and an unsubscribe link to the footer
Send a small test campaign and read the report before the big one
Segment anyone who clicked for a follow-up message
QUESTIONS PEOPLE ASK
Email marketing questions, answered
Is email marketing legal in the United States?
Yes. The CAN-SPAM Act, enforced by the FTC, allows commercial email as long as you follow its rules: honest headers, an honest subject line, a real physical address, and a working opt-out. It doesn't require opt-in consent first, but following opt-in practice anyway keeps your list healthier and your complaints lower.
What is the CAN-SPAM Act?
It's the federal law covering commercial email in the US, enforced by the Federal Trade Commission. It sets rules for accurate sender information, truthful subject lines, identifying ads as ads, including a physical address, and offering a clear opt-out that you honor within ten business days.
Do I need someone's permission before I email them?
CAN-SPAM doesn't legally require it, but it's the better way to build a list regardless. People who opted in open more, click more, complain less, and you never have to wonder where an address on your list came from.
How fast do I have to honor an unsubscribe request?
Within ten business days under CAN-SPAM. In practice, build it so it happens immediately: a one-click unsubscribe link that takes effect the moment someone clicks it is simpler to run and better for your reputation than any process with a delay built in.
What happens if my emails don't follow CAN-SPAM?
The FTC can pursue civil penalties against businesses that violate the Act, calculated per email in serious cases. Most problems start much smaller than that, though: a missing address or a broken opt-out link is usually a mistake you catch before you send, not a legal case.
How do I stop my emails from landing in spam?
Authenticate your sending domain with SPF, DKIM and DMARC, keep your list verified so you're not sending to dead addresses, and build up your sending volume gradually rather than sending everything to everyone on day one. All three matter together; none of them alone fixes a deliverability problem.
How often should I send?
Often enough to stay recognizable, rarely enough that people are glad to see you. Weekly or biweekly is a common, sustainable rhythm for a small business. Watch your unsubscribe and complaint rates after you change your frequency in either direction.
Can I buy an email list?
You can, but it causes more problems than it solves. A bought list hasn't opted in, doesn't know your name, and verifies badly, since purchased lists are full of stale and fake addresses. It also puts your sending domain's reputation at risk from the first send.
What's the difference between a human open and an automated open?
An automated open happens when a phone, mail app or security scanner opens a message to check it, with no person reading it. A human open is a real person opening your email. Reports that don't separate the two make every campaign look more read than it was; reports that do give you a number you can actually act on.
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