continued the kita-planer

src/lib/mail.ts

@@ -1,13 +1,14 @@
 import type { ReactNode } from "react";
 import { Resend } from "resend";
 
-const resend = new Resend(process.env.RESEND_API_KEY);
+let resendClient: Resend | null = null;
 
 type SendAppEmailInput = {
   to: string | string[];
   subject: string;
   react: ReactNode;
   from?: string;
+  replyTo?: string | string[];
 };
 
 type SendAppEmailResult =
@@ -31,6 +32,7 @@ export async function sendAppEmail({
   subject,
   react,
   from = process.env.EMAIL_FROM,
+  replyTo,
 }: SendAppEmailInput): Promise<SendAppEmailResult> {
   if (!process.env.RESEND_API_KEY) {
     return {
@@ -47,11 +49,13 @@ export async function sendAppEmail({
   }
 
   try {
-    const { data, error } = await resend.emails.send({
+    resendClient ??= new Resend(process.env.RESEND_API_KEY);
+    const { data, error } = await resendClient.emails.send({
       from: from!,
       to,
       subject,
       react,
+      replyTo,
     });
 
     if (error) {