Email remains one of the highest-return marketing channels available to businesses. You own your list, you control the message and you can reach customers directly without paying for every impression. Whether you send a weekly newsletter, promotional campaigns or automated follow-ups, email builds relationships that social algorithms and ad platforms can’t take away.
In Canada, email marketing also comes with some of the strictest rules in the world. Canada’s Anti-Spam Legislation (CASL) requires consent, identification and a working unsubscribe mechanism for commercial electronic messages and violations can be very costly. Meanwhile, major mailbox providers such as Gmail and Yahoo have tightened their requirements for bulk senders, making technical setup more important than ever.
This guide covers both sides: how to comply with CASL and inbox provider rules, and how to grow a list, build automations and write emails that drive revenue.
Quick answer: To run compliant email marketing in Canada, you need valid consent (express or implied) before sending commercial electronic messages, clear identification of the sender with contact information, and an unsubscribe mechanism that works for at least 60 days after sending and is honoured within 10 business days. You should also keep records of consent and authenticate your domain with SPF, DKIM and DMARC to meet mailbox provider requirements.
This article is general information, not legal advice. Review the CRTC’s official CASL guidance or consult a qualified adviser for decisions about your specific situation.
Key Takeaways
- CASL applies to commercial electronic messages sent to or from computers in Canada, including email and text messages.
- Express consent never expires unless withdrawn; implied consent has time limits.
- Every commercial message needs sender identification, contact details and a working unsubscribe link.
- Keep records proving how and when you obtained consent.
- Authentication, low complaint rates and list hygiene protect deliverability.
- Measure clicks, conversions and revenue; opens are less reliable than they used to be.
Understanding CASL
Canada’s Anti-Spam Legislation came into force on July 1, 2014. It applies to commercial electronic messages (CEMs), electronic messages that encourage participation in a commercial activity, such as promoting products, services, events or offers. It covers email, text messages and messages sent to electronic accounts, and it applies when a computer system in Canada is used to send or access the message.
The CRTC, the Competition Bureau and the Office of the Privacy Commissioner of Canada share responsibility for enforcement.
The three core requirements
- Consent: You must have express or implied consent to send the message.
- Identification: The message must identify the sender (and anyone on whose behalf it’s sent) and include contact information such as a mailing address and a phone number, email address or web address.
- Unsubscribe mechanism: Each message must include a clear, easy way to unsubscribe at no cost. The mechanism must remain valid for at least 60 days after the message is sent, and unsubscribe requests must be honoured within 10 business days.
Penalties
CASL allows administrative monetary penalties of up to $1 million per violation for individuals and up to $10 million per violation for businesses. Directors and officers can also be held liable in some circumstances.
Express vs. Implied Consent
| Express consent | Implied consent | |
|---|---|---|
| How it’s obtained | The person actively agrees, such as checking an unchecked box or submitting a sign-up form with clear disclosure | Arises from certain relationships or circumstances |
| Duration | Doesn’t expire unless the person withdraws it | Limited time periods |
| Examples | Newsletter sign-up, opt-in at checkout | Recent purchase, recent inquiry, conspicuously published business email |
| Best practice | Preferred and most reliable | Use as a bridge, then seek express consent |
Requesting express consent properly
When you ask for express consent, you must clearly state:
- The purpose for which consent is being sought
- Who is seeking consent (your business name, or the business on whose behalf you’re asking)
- Your contact information
- That the person can withdraw consent at any time
Pre-checked boxes don’t count as express consent. The person must take a positive action.
Common forms of implied consent
- Existing business relationship: a purchase, lease, contract or similar transaction within the past two years.
- Inquiry or application: an inquiry or application about your products or services within the past six months.
- Existing non-business relationship: certain relationships, such as donations or volunteering with registered charities, and memberships in clubs or associations, within specified periods.
- Conspicuous publication: a business email address published publicly without a statement saying the person doesn’t want unsolicited messages, where your message is relevant to their business role.
- Disclosure: someone gave you their electronic address without indicating they don’t want messages, and your message relates to their business role.
Because implied consent expires, many businesses send a friendly invitation to opt in before the implied consent period ends.
Keep records
The burden of proving consent falls on the sender. Record how, when and where each person consented, the wording they agreed to and any changes to their preferences.
Inbox Provider Requirements: Gmail and Yahoo
Since February 2024, Gmail and Yahoo have required senders, especially bulk senders, to meet stronger standards. Gmail defines bulk senders as those sending close to 5,000 or more messages a day to Gmail accounts. Key requirements and recommendations include:
- Authenticate your email with SPF and DKIM.
- Publish a DMARC policy for your sending domain, with alignment between your “From” domain and authentication.
- Offer one-click unsubscribe in marketing messages and process unsubscribes promptly.
- Keep spam complaint rates low. Gmail’s guidance is to stay below 0.3% and ideally well under 0.1%.
- Use valid forward and reverse DNS for sending servers and TLS for transmission.
Even if you send smaller volumes, these practices improve deliverability.
Deliverability Fundamentals
Authentication
- SPF lists the servers allowed to send email for your domain.
- DKIM signs your messages so receivers can verify they weren’t altered.
- DMARC tells receivers what to do with messages that fail authentication and sends you reports. Start with a monitoring policy (p=none), review reports, then move to quarantine or reject when you’re confident.
Sender reputation
Mailbox providers judge your reputation by engagement, complaints, bounces and spam trap hits. Protect it by:
- Sending only to people who want your emails
- Removing hard bounces immediately
- Suppressing long-term inactive subscribers or running re-engagement campaigns
- Never buying or renting lists
- Warming up new domains or dedicated IP addresses gradually
List hygiene for large lists
For large lists, hundreds of thousands of contacts or more, deliverability management becomes a discipline of its own: segmenting by engagement, throttling sends, monitoring complaint and bounce rates by provider, and considering dedicated IP addresses with careful warm-up.
Growing Your List the Right Way
- Valuable lead magnets: checklists, guides, templates, calculators or discount codes relevant to your audience.
- Website sign-up forms on high-traffic pages, blog posts and the footer.
- Thoughtful pop-ups timed to engagement or exit intent, easy to close and mobile-friendly.
- Checkout and booking opt-ins with unchecked boxes and clear wording.
- Events and webinars with registration consent.
- In-person sign-ups at stores, events or trade shows, with consent captured and recorded.
- Social media and ads that promote your newsletter or lead magnet.
Segmentation and Personalization
Sending the same message to everyone limits results. Segment by:
- Customer status: prospects, first-time customers, repeat customers, lapsed customers
- Interests and product categories
- Location
- Engagement level
- Purchase history and value
- Lead source
Personalization goes beyond using someone’s first name. Relevant content, timing and offers drive engagement.
Automations That Work While You Sleep
| Automation | Trigger | Goal |
|---|---|---|
| Welcome series | New subscriber | Introduce your brand, set expectations, make a first offer |
| Lead nurture | Lead magnet download or inquiry | Educate and move prospects toward a consultation or purchase |
| Abandoned cart | Cart started but not completed | Recover lost sales |
| Post-purchase | Purchase completed | Onboard, cross-sell and request reviews |
| Re-engagement | Inactive for a set period | Win back interest or clean the list |
| Review request | Service completed | Build social proof |
| Consent renewal | Implied consent nearing expiry | Convert to express consent |
Building a Newsletter People Look Forward To
- Pick a consistent schedule and stick to it.
- Lead with value: insights, tips, curated resources, behind-the-scenes stories and customer spotlights.
- Keep a balance between helpful content and promotional messages.
- Write strong subject lines that are specific and honest.
- Use one primary call to action per email.
- Design for mobile with readable fonts and tappable buttons.
- Make plain-text versions available and use accessible design: alt text, sufficient contrast and logical reading order.
Measuring What Matters
Apple’s Mail Privacy Protection, introduced in 2021, can inflate open rates by preloading emails for many users. Treat opens as a directional signal and focus on:
- Click-through rate and click-to-open rate
- Conversions and revenue attributed to email
- Unsubscribe and complaint rates
- Bounce rates
- List growth rate
- Revenue per subscriber or per email sent
Privacy Beyond CASL
CASL governs sending messages; privacy laws govern collecting and using personal information. PIPEDA and provincial laws — including Quebec’s Law 25 — require transparency about how you collect, use and store personal data. Your sign-up forms should link to a clear privacy policy, and you should choose email platforms with appropriate security and data-handling practices.
Choosing an Email Marketing Platform
Evaluate platforms on:
- Ease of building emails and automations
- Segmentation and personalization capabilities
- Deliverability tools and reputation
- Integrations with your CRM, e-commerce platform and website
- Consent tracking and record-keeping
- Reporting depth
- Pricing at your current and future list size
For very large lists, pricing models vary significantly. Compare total cost at scale, including dedicated IP options and send volume limits.
Common Email Marketing Mistakes
- Sending to purchased or scraped lists
- Using pre-checked consent boxes
- Missing sender identification or physical mailing address
- Broken or hidden unsubscribe links
- Ignoring implied consent expiry
- No SPF, DKIM or DMARC
- Sending too frequently without segmentation
- Measuring success by opens alone
Your CASL Compliance Checklist
- Audit how every contact on your list gave consent.
- Use unchecked boxes and clear wording for express consent.
- Track implied consent dates and expiry.
- Include sender identification and contact details in every message.
- Add a clear unsubscribe link that works for at least 60 days.
- Honour unsubscribes within 10 business days — ideally immediately.
- Keep consent records with time, source and wording.
- Authenticate your domain with SPF, DKIM and DMARC.
- Link to your privacy policy on every sign-up form.
- Review your process annually.
Frequently Asked Questions
Yes. CASL applies to commercial electronic messages sent to businesses as well as consumers. Some exemptions and implied consent provisions are relevant to business contexts, such as conspicuously published business addresses, but consent and identification rules still apply.
Implied consent based on an existing business relationship generally lasts two years from a purchase or contract, and six months from an inquiry or application. Express consent lasts until the person withdraws it.
Possibly, under implied consent if the person gave you the card without saying they don’t want messages and your message relates to their business role. Many businesses follow up by asking for express consent.
CASL doesn’t require double opt-in, but it’s a best practice that confirms email addresses, improves list quality and strengthens your consent records.
CASL allows administrative monetary penalties of up to $1 million per violation for individuals and $10 million for businesses. Enforcement actions can also damage your reputation and sender standing.
Common causes include missing authentication, high complaint rates, sending to unengaged or purchased lists, sudden spikes in volume, misleading subject lines and poor sender reputation.
Build an Email Program That’s Profitable and Compliant
Email marketing works best when it’s built on genuine permission. Respect consent, authenticate your domain, send relevant messages and measure what drives revenue, and your list becomes one of your most valuable business assets.
Netxeno helps Canadian businesses build compliant, high-performing email marketing programs — from platform selection and CASL-aligned sign-up flows to SPF, DKIM and DMARC setup, automations, newsletters and large-list deliverability management. Book a free email marketing review at netxeno.com/.
