THE FULL FIELD MANUAL
Email marketing in the United States, from the law to your first send
Everything a small business needs to start sending real campaigns: what the law requires, how to build a list the right way, and how to land in the inbox instead of the spam folder. No scrolls of fine print, just the parts that matter.
CAN-SPAM, translated into plain English
Every address checked before you send a thing
Month to month, no contracts, no catch
WHERE WE'RE MARCHING
What's inside this guide
Seven chapters, in the order you'll actually need them: the law before the list, the list before the campaign, the campaign before the results.
The basics: what email marketing actually does
The rules: CAN-SPAM 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: honest opens
Your checklist: ready to send
START HERE
What email marketing actually does
Email marketing is sending messages on purpose, to people who asked to hear from you, instead of hoping an algorithm shows them your post. A welcome note, a weekly roundup, a sale, a receipt: if it lands in someone's inbox with your name on it, that's email marketing.
It still wins for small businesses because you own it. A social platform can change its algorithm overnight and halve how many people see you. Your list is yours: nobody charges you to reach the people who already said yes.
Programs usually run in three shapes. Newsletters keep you present without asking for anything, sent on a steady beat. Promotional campaigns ask for the sale: a launch, a seasonal offer, a limited drop. Automated sequences fire on their own, triggered by what someone does: a welcome series the moment they join, a reminder when they leave a cart behind, a receipt the second they buy.
Running a program day to day looks less like marketing and more like upkeep: grow the list honestly, write and design campaigns worth opening, send them at a pace your sending domain can handle, read the results, then do more of what worked. None of those steps need a design degree or a law degree, which is exactly where the rest of this guide comes in.
KNOW THE RULES
The law, in plain English
The United States regulates commercial email mainly through the CAN-SPAM Act, enforced by the Federal Trade Commission. It applies to any email whose main purpose is advertising or promoting a product or service, including the ones you send from a small business account. What follows is general information, not legal advice: for anything specific to your business, talk to a lawyer.
The Act asks for a few concrete things on every commercial email:
- Honest headers: the 'From,' 'To' and routing information must identify you accurately, not someone else.
- No deceptive subject lines: the subject must reflect what's actually inside.
- Clear identification: if the message is an advertisement, say so.
- A physical postal address: every email needs a real one, yours or a registered mailbox.
- A working opt-out: a visible way to unsubscribe, with no fee and no login required.
- Honored within 10 business days: once someone opts out, you have ten business days to stop emailing them, and you can't sell or transfer their address to anyone else afterward.
You're also responsible for anyone who sends on your behalf, an agency or a freelancer, so it pays to know what they're doing in your name. Penalties are real: the FTC can pursue civil fines per violating email, and each email in breach can count separately, which adds up fast across a list of any size.
CAN-SPAM doesn't require someone to opt in before you email them for the first time, which surprises people. It requires honesty and an easy way out. In practice, permission-first lists perform better anyway: people who asked to hear from you open, click and buy more than people who didn't, and they complain less. The law sets a floor; building a list the right way, which is the next chapter, is how you build the ceiling.
GROW IT RIGHT
Building a list the right way
A list built on permission is worth more than a list built on size. Someone who typed their own email address into your form is a different reader to someone whose address you found, bought or guessed, and your results will show it immediately: more opens, fewer complaints, fewer bounces.
Sign-up forms are the honest front door. Put one on your website wherever people already pause: the footer, a blog post, checkout. If you don't have a website yet, a standalone landing page works just as well; it only needs a headline, a reason to join, and the form itself.
Give people a reason stronger than 'sign up for updates': a discount on the first order, early access to new arrivals, a genuinely useful guide. Whatever it is, deliver it the moment they join, in a welcome email that confirms what they'll get and how often you'll show up.
Never buy a list. A bought list hasn't agreed to hear from you, which means higher complaints, higher bounces, and a sending reputation that takes months to repair, if it recovers at all. Kadexin's sign-up forms follow your brand automatically and block automated sign-ups, and its landing pages are built from the same brief as your emails, so the page matches the message exactly.
SEND SOMETHING
Campaigns that work, and when to send them
Different messages earn different moments. Sending promotion after promotion burns out a list fast; a single well-timed newsletter can out-perform a dozen sales. Here's the shortlist worth having in your calendar, and the moment each one works hardest.
Whichever type you send, a single email rarely tells the whole story. Launch a campaign with a few designed variants, different subject lines or openers, rotated evenly across your whole list rather than a small sample, and let the results tell you which one actually earned the open.
Welcome series — fired the moment someone joins your list
Newsletter — a steady weekly or monthly beat that keeps you present
Promotional campaign — a launch, sale or seasonal offer with a deadline
Abandoned cart — minutes after someone leaves without buying
Win-back — to subscribers who've gone quiet for a while
Transactional — receipts and confirmations, sent the instant they're earned
REACH THE INBOX
Landing in the inbox, not the spam folder
Reaching the inbox starts with proving you are who you say you are. Three records do the proving: SPF lists which servers are allowed to send for your domain, DKIM signs each message so it can't be altered in transit, and DMARC tells inbox providers what to do with mail that fails the first two. Get them wrong, and even a perfectly honest email can land in spam.
Reputation is earned gradually, not claimed. A brand-new sending domain starts small and earns more volume as inbox providers see it behaving well; push too much mail too fast and you look exactly like the spammers those providers are built to catch. Gmail, Microsoft and Yahoo all watch differently, so the sending pace that works for one can be wrong for another.
List hygiene does the rest. Every bounce, every spam complaint and every dead mailbox chips away at your reputation, which is why checking addresses before you send matters more than checking them after. An address that bounces once is a warning; a list full of them is a pattern inbox providers remember.
Kadexin handles the parts that usually need a developer. It registers and authenticates your sending domain with SPF, DKIM and DMARC already set, builds volume at a pace each inbox provider trusts, and checks every address with its mail server before a campaign can go out, not after. 99.7% of mail sent across the platform gets delivered.
READ THE RESULTS
Measuring what actually matters
An open rate tells you less than it looks like it does. Many inboxes, Apple's Mail app among them, open images in every message automatically to protect their users' privacy, which counts as an open whether a human ever saw the email or not. Read opens on their own and you're measuring mail software, not interest.
Separate the automated opens from the human ones and the picture sharpens fast. A subject line that gets a flood of opens the second it sends, before anyone could plausibly have read it, is probably triggering automated scanning. A subject line whose opens trickle in over hours, alongside clicks, is reaching people.
Clicks, conversions and replies are harder to fake and worth more of your attention than opens ever were. So are the negative signals: unsubscribes tell you a message missed, and complaints tell you it actively annoyed someone, both worth reading campaign by campaign, not just as a total.
Kadexin's reporting classifies every open as automated or human in its own column, live from the moment your first message goes out, alongside delivered, clicked, bounced, complained and unsubscribed, so you're always reading what actually happened.
THIS WEEK
Your checklist for getting started
Write a sign-up form headline that states the actual reason to join
Add that form to your website footer, blog or checkout
Build a landing page if you don't have a website yet
Draft a welcome email that delivers on the sign-up promise immediately
Set up your sending domain with SPF, DKIM and DMARC
Import your existing list and verify every address before sending
Add your physical postal address to your email template
Build a visible, one-click unsubscribe link into every send
Plan your first three campaigns: welcome, newsletter, one promotion
Launch with two or three variants instead of guessing at one
Read human opens, clicks and complaints, not just the open rate
Honor every opt-out request within 10 business days
QUICK ANSWERS
Questions people search
Is email marketing legal in the United States?
Yes. Commercial email is legal and regulated by the CAN-SPAM Act, enforced by the Federal Trade Commission. Follow its core rules, honest headers, a real subject line, a physical address and a working opt-out, and you're sending within the law. This is general information, not legal advice.
Do I need someone's permission before I email them?
CAN-SPAM itself doesn't require opt-in consent before a first email, only honesty and an easy opt-out. In practice, permission-first lists built from sign-up forms perform far better and complain far less, so it's worth treating consent as the standard even where the law doesn't strictly demand it.
What has to appear in every marketing email?
Accurate sender and subject information, a clear note if the message is an advertisement, a physical postal address, and a visible way to unsubscribe that doesn't require a login or a fee. Those five things satisfy CAN-SPAM on every send.
How quickly do I have to process an unsubscribe?
Within 10 business days of the request, and you can't sell or transfer that address to anyone else afterward. Most campaigns process opt-outs automatically and immediately, which is simpler than tracking the deadline by hand.
What's the difference between a human open and an automated open?
A human open happens when a person actually opens your email. An automated open is recorded when mail software, like Apple's privacy-protecting image loading, opens it in the background to scan for threats. Counting both together inflates your open rate; reading them separately shows what subscribers actually did.
Why would a well-written email still land in spam?
Usually it's reputation, not writing. A sending domain without proper SPF, DKIM and DMARC records, a list full of dead addresses, or a sending pace that spikes too fast all look suspicious to inbox providers, regardless of how good the email itself is.
Can I buy an email list to get started faster?
You can, but it tends to cost you later: bought addresses haven't agreed to hear from you, which means more bounces, more complaints, and a damaged sending reputation that's slow to repair. Building your own list, even slowly, outperforms a bought one almost every time.
How is Kadexin different from doing this with no tools at all?
Kadexin registers and authenticates your sending domain, checks every address on your list before a campaign goes out, and reports human opens separately from automated ones, the parts of a compliant, deliverable program that usually take the most technical setup. You still choose what to send and when.
Can your team run my campaigns instead of me?
Yes. Our done-for-you plans start at $399 a month: our team plans, writes, designs and sends your campaigns, month to month, with no contract locking you in.
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