fix: added sender retry and handled fail

utils/sender.ts

@@ -5,10 +5,7 @@ type EmailTemplate = {
   template: JSX.Element;
 };
 
-export async function sendEmail(
-  to: string[],
-  { subject, template }: EmailTemplate
-) {
+async function sendEmail(to: string[], { subject, template }: EmailTemplate) {
   const resend = new Resend(process.env.RESEND_KEY);
 
   try {
@@ -17,14 +14,42 @@ export async function sendEmail(
       to,
       subject,
       react: template,
+      headers: {
+        'List-Unsubscribe': `<${process.env.HOME_URL}/unsubscribe>`
+      }
     });
 
     if (error) {
       console.log(error);
+
+      return false;
     }
   } catch (error) {
     console.log(error);
+
+    return false;
   }
 
   console.log('Email sent', subject, to.length);
+
+  return true;
+}
+
+export async function sender(
+  to: string[],
+  { subject, template }: EmailTemplate
+) {
+  let success = false;
+  let i = 5;
+
+  while (i < 5) {
+    const sent = await sendEmail(to, { subject, template });
+    if (sent) {
+      success = true;
+      break;
+    }
+    i++;
+  }
+
+  return success;
 }