diff --git a/Providers/MMFCustomersGroupsServiceProvider.php b/Providers/MMFCustomersGroupsServiceProvider.php
index 0eb10e9..47ce823 100644
--- a/Providers/MMFCustomersGroupsServiceProvider.php
+++ b/Providers/MMFCustomersGroupsServiceProvider.php
@@ -109,10 +109,16 @@ class MMFCustomersGroupsServiceProvider extends ServiceProvider {
 			$emails = new Collection;
 			foreach ( $groups as $group_id ) {
 				$group = CustomersGroup::find($group_id);
-				$emails->concat($group->emails());
+				$emails = $emails->concat($group->emails());
 			}
-			$emails = $emails->unique();
-			// TODO: Update $conversation to include this list of e-mails.
+			$emails = $emails->unique('email')->pluck('email');
+			// Update the list of cc emails.
+			$cc = array_unique(array_merge(
+				$conversation->getCcArray(),
+				$emails->toArray()
+			));
+			$conversation->setCc($cc);
+			$conversation->save();
 		}, 20, 2);
 	}
 }