FIX: Mailing list mode was not checking for user deleted posts

app/jobs/regular/notify_mailing_list_subscribers.rb

@@ -4,13 +4,10 @@ module Jobs
 
     def execute(args)
       post_id = args[:post_id]
-      if post_id
-        post = Post.with_deleted.find_by(id: post_id)
-        # our topic can be deleted as well
-        return if (post && post.trashed?) || !post.topic
-      end
+      post = post_id ? Post.with_deleted.find_by(id: post_id) : nil
 
       raise Discourse::InvalidParameters.new(:post_id) unless post
+      return if post.trashed? || post.user_deleted? || (!post.topic)
 
       users =
           User.activated.not_blocked.not_suspended.real

spec/jobs/notify_mailing_list_subscribers_spec.rb

@@ -0,0 +1,60 @@
+require "spec_helper"
+
+describe Jobs::NotifyMailingListSubscribers do
+
+  context "with mailing list on" do
+    let(:user) { Fabricate(:user, mailing_list_mode: true) }
+
+    context "with a valid post" do
+      let!(:post) { Fabricate(:post, user: user) }
+
+      it "sends the email to the user" do
+        UserNotifications.expects(:mailing_list_notify).with(user, post).once
+        Jobs::NotifyMailingListSubscribers.new.execute(post_id: post.id)
+      end
+    end
+
+    context "with a deleted post" do
+      let!(:post) { Fabricate(:post, user: user, deleted_at: Time.now) }
+
+      it "doesn't send the email to the user" do
+        UserNotifications.expects(:mailing_list_notify).with(user, post).never
+        Jobs::NotifyMailingListSubscribers.new.execute(post_id: post.id)
+      end
+    end
+
+    context "with a user_deleted post" do
+      let!(:post) { Fabricate(:post, user: user, user_deleted: true) }
+
+      it "doesn't send the email to the user" do
+        UserNotifications.expects(:mailing_list_notify).with(user, post).never
+        Jobs::NotifyMailingListSubscribers.new.execute(post_id: post.id)
+      end
+    end
+
+    context "with a deleted topic" do
+      let!(:post) { Fabricate(:post, user: user) }
+
+      before do
+        post.topic.update_column(:deleted_at, Time.now)
+      end
+
+      it "doesn't send the email to the user" do
+        UserNotifications.expects(:mailing_list_notify).with(user, post).never
+        Jobs::NotifyMailingListSubscribers.new.execute(post_id: post.id)
+      end
+    end
+
+  end
+
+  context "with mailing list off" do
+    let(:user) { Fabricate(:user, mailing_list_mode: false) }
+    let!(:post) { Fabricate(:post, user: user) }
+
+    it "doesn't send the email to the user" do
+      UserNotifications.expects(:mailing_list_notify).never
+      Jobs::NotifyMailingListSubscribers.new.execute(post_id: post.id)
+    end
+  end
+
+end