Transactional, triggered, and promotional emails may all land in the same inbox, but they don’t do the same job. They follow different rules, support different business objectives, and create value in different ways.
These distinctions matter more than they might seem. They impact everything from compliance and delivery to customer experience and revenue. Treating every email the same can lead to missed opportunities, unnecessary risks, or both.
Over the past decade, I’ve found it helpful to think of email in three categories: transactional, triggered, and promotional. The boundaries aren’t always clear, but this framework makes it easier to decide what an email should do, how it should behave, and what success will look like.
How I classify email types
Transactional
You can’t move forward without this email. Closes the loop on something the user just did.
Examples: Password reset, order confirmation, subscription renewal.
Oscar health insurance: Sent after registration. Requests the information necessary to complete insurance enrollment.
MarTech: Confirm conference registration and secure the participant’s seat.
Kiwi.com: Confirms a flight booking and provides complete itinerary details.
Triggered (behavioral)
Triggered by user action and sent at a specific time for each person.
- Examples: Cart abandonment, birthday emails, a guide someone requested, platform adoption emails like “you created X video this week.” It’s worth keeping in mind: “Not all triggered messages are transactional, but all transactional messages are triggered.” — Len Shneyder, “Unlocking the Full Potential of Transactional Email”
Grammar: Triggered by account activity or inactivity in the last week. Provides a summary of user engagement and writing activity.
Meal train: It activates after someone joins a meal train for a friend’s family. Confirm participation.
Comic books: Triggered by a plan update. Explain the features of the new plan and highlight what was unlocked after switching from the previous plan.
Promotional (commercial)
Everything the company wants to communicate. Yes, even important product updates count as promotional emails.
- Examples: A sale, a new podcast episode, a letter from the founder, search results.
Cork cycle: Promotes an essential weekend set.
Zillow: Shares educational and value-focused content on home mortgages and current interest rates.
Terrain: Promotes home and garden essentials and highlights current sales and offers.
Side note: Both MarTech and Meal Train emails confirm participation, but they work differently.
I classified the MarTech email as transactional because it confirms registration and provides the login link needed to join the event.
I classified the Meal Train email as triggered because participation is already confirmed on the website and the email primarily serves as a follow-up with additional context and information.
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What every email should do
Knowing what type of email is helps, but it’s equally important to know what job each does.
- Transactional: Fulfill a user request and provide critical information. Don’t sell.
- Triggered: Maintain the relationship and cultivate engagement based on user actions.
- Promotional: Stimulate interest and generate revenue.
Keeping these jobs separate makes it much easier to write better emails and avoid mixing the wrong things together.
Rules for unsubscribing
Respecting someone’s inbox means respecting their right to leave it.
Transactional
Users cannot unsubscribe from transactional emails. This is by design. The email links to something they did or a service they use. Add a short explanation in the footer so users don’t feel trapped.
Something like:
- “You are receiving this email in connection with your account or a recent inquiry. Because it is necessary to provide our service and is not promotional, it is sent without regard to your marketing email preferences and does not include an unsubscribe link.”
A real example from Patreon:
- “You have received this mandatory service announcement email to update you on important changes to Patreon’s Terms of Use and Privacy Policy.”
Promotional
Users should be able to unsubscribe easily and manage their preferences so they can opt out of specific types of emails, such as product updates, discounts, or event emails, not just all or nothing.
Senders must include one-click unsubscribe functionality in the body of all outgoing promotional emails. This is a requirement, not a welcome thing.
Triggered
The same rules apply to promotional emails. Users should be able to unsubscribe easily.
A good rule of thumb: if the user didn’t ask for it and it’s not tied to a specific action, they should be able to turn it off.
Which email types earn the most money?
Email is not just a communication tool. Depending on the type, it can be a serious revenue driver.
Transactional
Open rates for transactional emails are two-three times higher compared to those for promotional emails, according to MailerToGo’s 2025 benchmark report. This means that transactional emails are more than just compliance obligations. You already have the user’s attention.
This is the most read email you will ever send. This makes order confirmations and shipping notifications a real cross-sell and up-sell opportunity. We’ll talk about it later.
Triggered
Triggered emails generate the highest revenue per send. Klaviyo data from 2026 shows that flows are being generated about 41% of total email revenue from just 5.3% of sends, with revenue per recipient approximately 18 times higher than promotional emails.
Promotional
Promotional emails generate the highest volume, but the lowest efficiency per send. The overall ROI of the email channel is often quoted as $36 for every $1 spentbut automation increases much of that throughput. Promotional is where most people start, but it’s the least efficient of the three per recipient.
If I had to prioritize, I would set up transactional emails first, then build triggered flows, and thirdly scale promotions. ROI follows this order.
The gray areas
Is the welcome email transactional or promotional?
There is a lot of debate about this. My take: The first welcome email, especially if it includes an account activation step, is in a gray area. But it should still include an unsubscribe option because the user has subscribed to the communication, not a blocked relationship.
Is it OK to add a promotional banner to a transactional email?
We just learned that transactional emails get a higher open rate, so the temptation is real. The CAN-SPAM Act addresses this issue through the concept of primary purpose.
When an email contains both transactional and promotional content, the primary purpose of the message determines how it is treated. Each brand has to decide how they feel about it.
Where email programs fail
Using multiple email platforms without syncing them
Many businesses use one platform for transactional emails and another for promotional emails. This is common and sometimes makes sense. But if platforms don’t communicate with each other, visibility into the full picture of what a user is receiving is lost.
For smaller companies, this might look like company updates sent through an ESP, a newsletter through Substack, and event emails through a third tool. Someone on that list might receive five emails in a week. If they unsubscribe from one platform, they will continue to receive emails from the others.
Don’t separate sending reputation between email types
Transactional and promotional emails should run on separate IPs or, at a minimum, separate subdomains. If a promotional campaign performs poorly and damages your sending reputation, your transactional emails are taken down with it. This means users will no longer receive password resets and order confirmations.
Skip the authentication setup
Google and Yahoo now require SPF, DKIM, and DMARC for bulk senders. They apply to all email types, but skipping them hurts transactional emails the most because those are the emails users actually need to receive.
Nobody has the full picture
In mid-sized companies in particular, marketing or product teams write and send transactional emails, but IT owns the technical setup. When something breaks, no one has the full context to fix it quickly. It’s worth getting everyone in the same room at least once to determine who owns what.
Build your email program in this order
Think of your emails like a wardrobe:
- Transactional emails are the basics you can’t leave home without.
- Activated emails are the outfit that makes you feel like yourself.
- Promotional emails are whatever you want to say.
You can’t achieve a complete look by wearing only half an outfit, and accessories mean nothing if you’re missing the basics.
The good news is that you don’t need to create it all at once. Start with transactional emails, add triggered flows, and then scale promotional emails. This order is important because the first two run on autopilot and generate revenue. Promotional emails alone cannot do this. They should never have done this.
