diff --git a/apps/api/src/services/ActivityService.ts b/apps/api/src/services/ActivityService.ts
index 2e5ed4d..0d88508 100644
--- a/apps/api/src/services/ActivityService.ts
+++ b/apps/api/src/services/ActivityService.ts
@@ -480,6 +480,21 @@ export class ActivityService {
           },
         });
       }
+
+      // Email complaint
+      if (email.complainedAt && (!types || types.includes(ActivityType.EMAIL_COMPLAINT))) {
+        activities.push({
+          id: `${email.id}_complaint`,
+          type: ActivityType.EMAIL_COMPLAINT,
+          timestamp: email.complainedAt,
+          contactEmail: email.contact.email,
+          contactId: email.contactId,
+          metadata: {
+            ...baseMetadata,
+            error: email.error,
+          },
+        });
+      }
     }
 
     return activities;
diff --git a/apps/web/src/components/ActivityItem.tsx b/apps/web/src/components/ActivityItem.tsx
index 0152c72..386d34d 100644
--- a/apps/web/src/components/ActivityItem.tsx
+++ b/apps/web/src/components/ActivityItem.tsx
@@ -11,6 +11,7 @@ import {
   Eye,
   MousePointerClick,
   Send,
+  ShieldAlert,
   Workflow,
   XCircle,
   Zap,
@@ -95,7 +96,14 @@ function getUpcomingTime(date: Date): string {
  * Check if an activity is an email activity
  */
 function isEmailActivity(type: string): boolean {
-  return ['email.sent', 'email.delivered', 'email.opened', 'email.clicked', 'email.bounced'].includes(type);
+  return [
+    'email.sent',
+    'email.delivered',
+    'email.opened',
+    'email.clicked',
+    'email.bounced',
+    'email.complaint',
+  ].includes(type);
 }
 
 interface ActivityItemProps {
@@ -226,6 +234,23 @@ function getActivityConfig(activity: Activity): ActivityConfig {
         },
       };
 
+    case 'email.complaint':
+      return {
+        icon: ShieldAlert,
+        color: 'text-red-600',
+        bgColor: 'bg-red-100',
+        title: (typeof metadata.subject === 'string' ? metadata.subject : undefined) || 'Spam complaint',
+        description: metadata.campaignName
+          ? `Campaign: ${String(metadata.campaignName)}`
+          : metadata.workflowName
+            ? `Workflow: ${String(metadata.workflowName)}`
+            : 'Recipient marked as spam',
+        badge: {
+          label: 'Complaint',
+          variant: 'destructive',
+        },
+      };
+
     case 'workflow.started':
       return {
         icon: Workflow,
diff --git a/apps/web/src/pages/activity/index.tsx b/apps/web/src/pages/activity/index.tsx
index ef41795..ebb9b0b 100644
--- a/apps/web/src/pages/activity/index.tsx
+++ b/apps/web/src/pages/activity/index.tsx
@@ -119,12 +119,14 @@ export default function ActivityPage() {
                     <SelectContent>
                       <SelectItem value="ALL">All Activity Types</SelectItem>
                       <SelectItem value="event.triggered">Events</SelectItem>
-                      <SelectItem value="email.sent,email.delivered,email.opened,email.clicked,email.bounced">
+                      <SelectItem value="email.sent,email.delivered,email.opened,email.clicked,email.bounced,email.complaint">
                         Emails
                       </SelectItem>
                       <SelectItem value="email.sent">Emails Sent</SelectItem>
                       <SelectItem value="email.opened">Emails Opened</SelectItem>
                       <SelectItem value="email.clicked">Emails Clicked</SelectItem>
+                      <SelectItem value="email.bounced">Emails Bounced</SelectItem>
+                      <SelectItem value="email.complaint">Email Complaints</SelectItem>
                       <SelectItem value="workflow.started,workflow.completed">Workflows</SelectItem>
                     </SelectContent>
                   </Select>
diff --git a/packages/types/src/api/activity.ts b/packages/types/src/api/activity.ts
index 48717f8..edb4256 100644
--- a/packages/types/src/api/activity.ts
+++ b/packages/types/src/api/activity.ts
@@ -12,6 +12,7 @@ export enum ActivityType {
   EMAIL_OPENED = 'email.opened',
   EMAIL_CLICKED = 'email.clicked',
   EMAIL_BOUNCED = 'email.bounced',
+  EMAIL_COMPLAINT = 'email.complaint',
   CAMPAIGN_SENT = 'campaign.sent',
   CAMPAIGN_SCHEDULED = 'campaign.scheduled',
   WORKFLOW_STARTED = 'workflow.started',