Email and communication

Comprehensive documentation for email and communication in KilatKoding, including welcome email, invoice email, sender domains, and core triggers.

Email often looks small at the start of a project, but it is important for onboarding, billing, and public communication. This area covers transactional email and email sent from the contact form.

What this feature includes

• welcome email
• invoice email
• sender identity for product email
• contact-form email delivery

Related routes and flows

Route or flow	Type	Purpose
/contact and POST /api/contact	Contact flow	Sends inquiry email from public visitors
/auth/sign-up and /auth/verify-email	Onboarding flow	Provides the context for onboarding or verification email when that flow is enabled
/checkout, /order/[id], and /payment/callback	Billing flow	Provides the context for invoice email or transaction status updates

There is no standalone public “email page.” Instead, email is triggered from other flows such as auth, contact, and billing, while the final behavior depends on your email templates and provider setup.

Main dependencies

Item	Required?	Notes
RESEND_API_KEY	Yes if email is active	Required for sending
EMAIL_FROM	Strongly recommended	Official sender identity
CONTACT_EMAIL	Optional	Used for contact-form destination inbox
Email templates	Yes	Define transactional email content

Main files

Area	File
Welcome email	emails/welcome.tsx
Invoice email	emails/invoice.tsx
Contact-form sending	app/api/contact/route.ts or equivalent

What teams usually customize

• sender domain,
• tone of voice,
• visual email branding,
• subject lines,
• welcome email content,
• invoice wording,
• which triggers should remain active.

What teams often forget

• EMAIL_FROM still uses a placeholder,
• the sender domain is not yet verified,
• invoice email still reflects the old brand,
• the contact inbox still points to an outdated address.

Verification checklist

1. The sender domain is verified.
2. Welcome email can be tested.
3. Invoice email renders correctly.
4. Contact form messages arrive in the right inbox.
5. All emails already use the live brand identity.

If you are still setting up the provider, also open Services setup.