Transactional email
Transactional email is a message triggered by a user's action or account event — order confirmations, password resets, receipts, shipping updates — sent one-to-one in response to something the recipient did.
What counts as transactional
Transactional emails are triggered by an individual's activity, not a marketing calendar. They carry information the recipient is expecting and usually needs right away.
- Order and payment confirmations, invoices and receipts
- Password resets and one-time passcodes (OTP)
- Account notifications: sign-in alerts, verification links
- Shipping and delivery updates
- Booking, appointment and reservation confirmations
Transactional vs marketing email
The distinction matters technically and legally. Transactional mail is expected, time-sensitive and one-to-one, so it typically posts the highest open rates of anything you send. Marketing mail is promotional and requires explicit consent and an unsubscribe option.
Because their reputations differ, many senders route the two streams separately — often on distinct IPs or subdomains — so a marketing complaint spike can't delay a password-reset email.
How transactional email is sent
Transactional messages are usually sent programmatically: your application calls an email API (or triggers via SMTP) at the exact moment the event happens, passing the recipient and any dynamic data. Delivery speed and reliability matter more here than for any other mail — a delayed OTP is a broken login.
Frequently asked questions
Do transactional emails need an unsubscribe link?
Purely transactional messages generally don't require one, since they're not promotional. But if you mix marketing content in, that portion is subject to consent and unsubscribe rules.
Can I include promotions in a transactional email?
A small, secondary cross-sell is common, but the message must stay primarily transactional. Lead with marketing content and it legally becomes a marketing email.
Why send transactional mail on a separate stream?
To protect it. Isolating transactional from marketing means promotional complaints or throttling can't delay critical mail like receipts and password resets.
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