feat: enable List-Unsubscribe headers in campaign emails (#96)

* feat: add `precendence: bulk` header for campaign emails

* feat: create and pass unsubUrl to to email queue for campaign

* fix: add correct `List-Unsubscribe-Post` header value

apps/web/src/server/service/campaign-service.ts

@@ -270,9 +270,10 @@ export async function sendCampaignEmail(
 
   // Queue emails
   await Promise.all(
-    emails.map((email) =>
-      EmailQueueService.queueEmail(email.id, domain.region, false)
-    )
+    emails.map((email) => {
+      const unsubscribeUrl = createUnsubUrl(email.contactId, campaignId);
+      EmailQueueService.queueEmail(email.id, domain.region, false, unsubscribeUrl);
+    })
   );
 }
 

apps/web/src/server/service/email-queue-service.ts

@@ -100,12 +100,13 @@ export class EmailQueueService {
     const queue = transactional
       ? this.transactionalQueue.get(region)
       : this.marketingQueue.get(region);
+    const isBulk = !transactional;
     if (!queue) {
       throw new Error(`Queue for region ${region} not found`);
     }
     queue.add(
       emailId,
-      { emailId, timestamp: Date.now(), unsubUrl },
+      { emailId, timestamp: Date.now(), unsubUrl, isBulk },
       { jobId: emailId, delay }
     );
   }
@@ -169,7 +170,12 @@ export class EmailQueueService {
 }
 
 async function executeEmail(
-  job: Job<{ emailId: string; timestamp: number; unsubUrl?: string }>
+  job: Job<{
+    emailId: string;
+    timestamp: number;
+    unsubUrl?: string;
+    isBulk?: boolean;
+  }>
 ) {
   console.log(
     `[EmailQueueService]: Executing email job ${job.data.emailId}, time elapsed: ${Date.now() - job.data.timestamp}ms`
@@ -207,6 +213,7 @@ async function executeEmail(
 
   console.log(`[EmailQueueService]: Sending email ${email.id}`);
   const unsubUrl = job.data.unsubUrl;
+  const isBulk = job.data.isBulk;
 
   const text = email.text
     ? email.text
@@ -240,6 +247,7 @@ async function executeEmail(
           configurationSetName,
           attachments,
           unsubUrl,
+          isBulk,
         });
 
     // Delete attachments after sending the email