Sales Loves MarketingA good transactional email tells the customer, in the subject line and first sentence, that what they just did worked. It then gives the details they need next and a clear way to get help. Keep it focused: Google's sender guidelines advise against putting promotions in messages such as sales receipts, so send marketing separately.
What is a transactional email?
A transactional email is an automated message triggered by something a person did or by a change to their account. Common examples:
- order and booking confirmations
- receipts and invoices
- shipping and delivery updates
- account sign-up and email verification
- password resets and login alerts
- changes to a subscription, plan or terms
- usage reports and billing reminders
The US CAN-SPAM Act treats "transactional or relationship" messages differently from commercial email. According to the Federal Trade Commission, a message falls into this category only if it consists of content that:
- facilitates or confirms a transaction the recipient has already agreed to
- gives warranty, recall, safety or security information about a product or service
- tells the recipient about changes to terms, features or account balance in an ongoing relationship such as a subscription
- provides information about employment or employee benefits
- delivers goods or services as part of a transaction the recipient has agreed to
The FTC reads these categories narrowly. An existing customer relationship alone does not make a message transactional.
Why do transactional emails matter?
Customers expect these messages and often wait for them. A password reset that arrives late or lands in spam is a support ticket. A confusing invoice delays payment. A clear order confirmation reduces "where is my order" questions. Transactional emails are part of the product experience, and for many customers they are the most frequent contact they have with your brand.
How do you structure a transactional email?
Use the inverted pyramid: the most important information first, then supporting details, then extras. It is the same structure journalists use. Our guide to the inverted pyramid style of writing explains it in depth.
1. Start with the purpose
The subject line, preheader and first line should say exactly what happened. "Your order #10482 is confirmed" is better than "Thanks for shopping with us". For a password reset, say "Reset your password" and put the button near the top.
2. Give the details the customer needs next
After the headline, add what the customer needs to act or check:
- Order confirmation: items, total, delivery address and expected delivery date
- Invoice: amount, due date, payment method and a link to download
- Sign-up: the one action needed to get started
- Password reset: the link, how long it is valid and what to do if they didn't ask for it
Use short sentences, clear labels and one main button.
3. End with help, not a hard sell
Close with useful supporting information:
- how to contact support
- a link to the account or order page
- a security note, such as "Didn't request this? You can ignore this email."
- a short help article or getting-started guide related to the transaction
Can you add marketing content to a transactional email?
You can, but there are good reasons not to.
The law. Under CAN-SPAM, a message that mixes commercial and transactional content is judged by its primary purpose. The FTC says it counts as commercial if a reasonable recipient would read the subject line as an ad, or if the transactional content does not appear mainly at the beginning. A commercial message must follow all CAN-SPAM rules, including a working opt-out. Each email in violation can bring penalties of up to $53,088, according to the FTC's guide. Other countries have their own rules, so check where your recipients are.
Deliverability. Google's email sender guidelines say: "Don't mix different types of content in the same message. For example, don't include promotions in sales receipt messages." Keeping each type of message separate protects the emails customers rely on most.
Trust. A customer resetting a password wants to log in, not see a discount.
What does fit is content that helps the customer get value from what they just did:
- setup steps or a getting-started guide after a sign-up
- care or usage tips after a purchase
- a link to the help center or onboarding webinar
- a request for feedback on the order or support experience
Cross-sells, upsells and referral offers belong in separate marketing emails to people who have agreed to receive them. Our guides on cross-selling examples, effective upselling techniques and emails that build customer relationships show how to do that well.
How should a transactional email look?
Design for clarity first and brand second.
- Match your brand in logo, colours and tone, so the email is clearly from you and harder to mistake for phishing.
- Keep the layout simple: one column, generous spacing and a clear hierarchy.
- Design for mobile. Make buttons large enough to tap and text readable without zooming.
- Don't rely on images. Put key information in live text, so it shows even when images are blocked, and add alt text to images.
- Include a plain-text version for clients and readers that need it.
Tone can reflect your audience. A developer tool can be brief and technical. A consumer brand can be warmer. The structure stays the same.
How do you make sure transactional emails arrive?
Deliverability matters more for transactional email than for any other kind, because customers need these messages. Google's sender guidelines require:
- All senders: SPF or DKIM authentication, valid forward and reverse DNS, TLS, and a spam rate below 0.3%
- Senders of 5,000 or more messages a day to Gmail: SPF and DKIM, a DMARC policy, a From domain aligned with SPF or DKIM, and one-click unsubscribe for marketing and subscribed messages
Google recommends keeping reported spam rates below 0.1%. It also advises using the same From address for messages of the same category and, if you send from several IP addresses, a different IP address for each type of message. Read more in our guide to the importance of email deliverability and the glossary entry on DKIM.
How do you measure and improve transactional emails?
Track delivery rate, bounces, spam complaints, clicks on the main action and support tickets about the topic of each email. Be careful with open rates: Apple's Mail Privacy Protection downloads remote content when a message arrives, not when it is read, so opens are inflated for those users.
Test changes one at a time, such as subject line wording or button placement, and check that every trigger still fires. Review all your transactional templates at least when you change your product, pricing or brand, so no customer gets outdated information.
Frequently asked questions
What is a transactional email?
A transactional email is an automated message triggered by something a person did or by a change to their account, such as an order confirmation, password reset, receipt or shipping update. Under the US CAN-SPAM Act, transactional or relationship messages are exempt from most of the rules for commercial email.
Can I include marketing in a transactional email?
Under CAN-SPAM, a message stays transactional only if its primary purpose is transactional, judged by the subject line and whether the transactional content appears mainly at the beginning. Google's sender guidelines go further and advise against promotions in messages such as sales receipts. The safer choice is to keep promotions in separate marketing emails.
Do transactional emails need an unsubscribe link?
CAN-SPAM's opt-out requirement applies to commercial messages, not to messages whose primary purpose is transactional. Google requires one-click unsubscribe for marketing and subscribed messages from bulk senders. If you add promotional content, the message may count as commercial and need an opt-out.
Should transactional and marketing emails come from different addresses?
Google recommends that messages of the same category use the same From address and, if you send from several IP addresses, a different IP address for each message type. Many companies also use a separate subdomain for each type, so a problem with marketing email doesn't affect password resets and receipts.