Next.js is the leading React meta-framework — the single most-used framework in the 2025 Stack Overflow Developer Survey. next-mailkite adds a signature-verified inbound webhook route handler for the App Router plus a sendEmail() wrapper over the MailKite SDK, alongside React Email templating and ESP SDKs (Resend, SES, Mailgun) in server actions and route handlers.
Install next-mailkite for a signature-verified inbound webhook route handler and sendEmail() — or call the MailKite SDK directly from server actions or route handlers.
Read the full setup guideA minimal, copy-paste starter. Swap in your own domain and API key.
# Any app that accepts an SMTP server works with MailKite
MAIL_HOST=smtp.mailkite.dev
MAIL_PORT=587 # STARTTLS (or 465 for TLS)
MAIL_ENCRYPTION=tls
MAIL_USERNAME=mailkite # username is ignored
MAIL_PASSWORD=mk_live_... # your MailKite API key
MAIL_FROM_ADDRESS=you@yourdomain.com # on a verified domain
MAIL_FROM_NAME=Next.js Point a domain, set one SMTP endpoint, send your first email in minutes. Unlimited domains, no credit card.