Authentication
Password reset
Time-limited link, single-use. Delayed or missing delivery becomes a support ticket and a blocked account recovery.
Latency-critical · security-sensitive
Templates
The messages your users
actually open.
Transactional templates are time-critical and often security-sensitive. Use clear subjects, short body copy and a single primary action. Below are common patterns and why delivery matters for each.
Authentication
Verification code (OTP)
One-time codes must arrive in seconds or the sign-in flow breaks. Never share with support; short expiry.
Latency is the product
Ecommerce
Order confirmation
Doubles as a receipt. Customers search for it months later — it must be delivered and findable in the inbox.
Record of purchase
Billing
Invoice
A financial record. Bounces here become failed payments and reconciliation work for both sides.
Payment & compliance path
Lifecycle
Welcome
The first message from your domain. It sets the sender reputation every later transactional email inherits.
Reputation foundation
Security
New-device / login alert
Users expect these immediately. Late alerts reduce trust; undelivered ones leave accounts unprotected.
Trust & security
Send templates via the Email API or SMTP relay. Tag messages (e.g. auth.password_reset) so logs and webhooks stay searchable.