CASL and CAN-SPAM Rules Every Realtor Should Know

Email marketing law isn’t complicated for agents who are doing things right — using a real list, mailing people who know you, and giving them an easy way to unsubscribe. But there are specific requirements you need to know, and the rules differ depending on whether you’re in the US, Canada, or emailing across the border.

This is a practical plain-English overview, not legal advice. If you have a specific situation that concerns you, consult a lawyer.

CAN-SPAM: The US Framework

CAN-SPAM (Controlling the Assault of Non-Solicited Pornography And Marketing Act) covers commercial email sent in the United States. The key things to know:

It’s opt-out, not opt-in. Unlike Canada’s rules, CAN-SPAM doesn’t require you to have permission before you send a commercial email. You can email a prospect you’ve never met, as long as you meet the other requirements.

What it requires in every email:

• A physical mailing address. Your brokerage address or a P.O. box. Has to be real and deliverable.
• A clear way to unsubscribe. A visible link or reply instructions. Not hidden in a 6-point footnote.
• No deceptive from-line or subject line. You can’t send as “Your Bank” or use a subject line that lies about the content.
• Accurate routing information. The technical headers (which your ESP handles automatically) have to reflect where the message actually came from.

Honor unsubscribe requests within 10 business days. Most ESPs process these immediately. The 10-day window is the maximum allowed, not a target.

The penalties for willful violations can be significant, but in practice, agents running a legitimate newsletter with a reputable ESP are compliant automatically. Your email marketing tool for real estate agents handles the technical requirements on your behalf.

CASL: The Canadian Framework

CASL (Canada’s Anti-Spam Legislation) is meaningfully stricter than CAN-SPAM. It applies to any commercial electronic message sent to or from a Canadian computer — which covers virtually all Canadian agents and anyone emailing Canadian contacts.

It’s opt-in by default. You generally need consent before sending. There are two types:

Express consent: The person explicitly said “yes, email me.” A checked checkbox on a signup form, a verbal agreement you’ve documented, or a written request. Express consent doesn’t expire (unless they withdraw it).

Implied consent: Consent you can infer from the relationship, without a formal opt-in. For real estate agents, the most important implied consent categories are:

• Existing business relationship within the last 2 years. If you closed a transaction with someone in the last two years, you have implied consent to send them commercial messages — but that window expires. After two years with no new transaction, you need to get express consent or stop sending.
• Conspicuous publication. If someone publishes their email address on a website without a “no commercial email” notice, you may have implied consent — but this is a narrower category and not a reliable basis for a newsletter list.

What CASL requires in every email:

• Your name and contact information (or the person/business on whose behalf you’re sending)
• A physical mailing address or phone number where you can be reached
• A working unsubscribe mechanism that’s processed within 10 business days

The practical implication for Canadian agents: Your past clients from the last two years are covered by implied consent. Past clients from further back need to opt in if you’re starting a newsletter or adding them to a new list. The guide to importing past clients into your newsletter covers the opt-in process for older contacts.

Where Things Get Complicated: Cross-Border Sends

If you’re a Canadian agent with contacts in the US, or vice versa, you need to meet the stricter of the two standards for those contacts. In practice, that means applying CASL’s consent requirements to anyone who could be in Canada, even if you’re not certain.

The safest approach: use express opt-in for all new subscribers regardless of where they’re located. It’s the cleanest compliance position and the one that causes the fewest problems long-term.

The Unsubscribe Requirement: Both Laws

Both CAN-SPAM and CASL require that you:

1. Include a clear and conspicuous way to unsubscribe in every commercial email
2. Process unsubscribe requests promptly (within 10 business days in both laws)
3. Honor the unsubscribe — you cannot continue emailing someone who has unsubscribed

Your ESP’s built-in unsubscribe link handles all of this mechanically. The error agents make is using a different system — sending newsletters from a CRM that doesn’t track unsubscribes against the same list as their ESP, for example. Make sure your unsubscribe data is synchronized across every system you use to email the same contacts.

What This Means for Your Physical Address

Both laws require a physical address in your emails. For most agents this is straightforward: put your brokerage’s address, your office address, or a P.O. box in the footer. Your ESP likely has a dedicated field for this in your account settings — fill it in once and it populates automatically.

Your full email marketing guide covers the broader deliverability picture that goes alongside compliance — because staying legal and landing in the inbox are related but not identical problems.

The Bottom Line

If you’re mailing a legitimate list of past clients and warm contacts through a reputable ESP, with a real unsubscribe link and your address in the footer, you’re essentially compliant with both laws. The rules are designed to stop spam — not to make it hard for agents with real relationships to stay in touch. Build your list properly, respect unsubscribes, and don’t mail people you’ve had no contact with in years without refreshing their consent.