Zapmail requires the following environment variables to be set for proper operation.Documentation Index
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Server configuration
The port number on which the SMTP server listens for incoming connections.The server will fail to start if this variable is not set.Example:
2525 or 25Database configuration
Backend database connection
PostgreSQL connection string for the Supabase database used by the Go backend.This string contains all necessary database connection parameters including host, port, database name, user, and password.The server will fail to start if this variable is not set or if the database cannot be reached.Example:
postgresql://user:password@host:5432/databaseUsage: backend/main.go:174Frontend database connection
PostgreSQL connection string for the frontend Next.js application.This connection string is used by the Next.js server actions to query emails from the database.Example:
postgresql://user:password@host:5432/databaseUsage: ui/src/lib/db.ts:4Both
SUPABASE_CONN_STRING and DATABASE_URL should point to the same PostgreSQL database but are used by different parts of the application (backend vs frontend).Environment files
Backend environment file
You can set these variables in a.env file in the backend directory:
.env file if present (backend/main.go:28-32).
Frontend environment file
For the Next.js frontend, create a.env.local file in the ui directory: