SMTP: extend env parsing (domain/auth/starttls); add unit test with mocked TLS for sendSmtpMail; extend SmtpConfig; docs to set .env locally

src/lib/env.ts

@@ -8,8 +8,11 @@ const envSchema = z.object({
   NEXT_PUBLIC_APP_URL: z.string().url().optional(),
   SMTP_ADDRESS: z.string().optional(),
   SMTP_PORT: z.coerce.number().optional(),
+  SMTP_DOMAIN: z.string().optional(),
   SMTP_USERNAME: z.string().optional(),
   SMTP_PASSWORD: z.string().optional(),
+  SMTP_AUTHENTICATION: z.string().optional(),
+  SMTP_ENABLE_STARTTLS_AUTO: z.string().optional(),
   SMTP_TLS: z.string().optional(),
   MAILER_SENDER_EMAIL: z.string().optional(),
 })
@@ -31,9 +34,12 @@ export const env = {
     ? {
         host: parsed.data.SMTP_ADDRESS,
         port: parsed.data.SMTP_PORT ?? 465,
+        domain: parsed.data.SMTP_DOMAIN,
         username: parsed.data.SMTP_USERNAME,
         password: parsed.data.SMTP_PASSWORD,
         tls: (parsed.data.SMTP_TLS ?? "true").toLowerCase() === "true",
+        starttls: (parsed.data.SMTP_ENABLE_STARTTLS_AUTO ?? "false").toLowerCase() === "true",
+        auth: parsed.data.SMTP_AUTHENTICATION ?? "login",
         from: parsed.data.MAILER_SENDER_EMAIL ?? "no-reply@example.com",
       }
     : null,

src/server/email-smtp.ts

@@ -6,6 +6,7 @@ type SmtpConfig = {
   username: string
   password: string
   from: string
+  tls?: boolean
 }
 
 function b64(input: string) {
@@ -66,4 +67,3 @@ export async function sendSmtpMail(cfg: SmtpConfig, to: string, subject: string,
     socket.on("error", reject)
   })
 }
-