FIX: Force enable user PM emails option when user posts to a group by email.

lib/email/receiver.rb

@@ -609,6 +609,11 @@ module Email
     end
 
     def create_group_post(group, user, body, elided, hidden_reason_id)
+      # ensure user PM emails are enabled (since user is posting via email)
+      if !user.staged && !user.user_option.email_private_messages
+        user.user_option.update!(email_private_messages: true)
+      end
+
       message_ids = Email::Receiver.extract_reply_message_ids(@mail, max_message_id_count: 5)
       post_ids = []
 

spec/components/email/receiver_spec.rb

@@ -609,6 +609,14 @@ describe Email::Receiver do
       expect(Post.last.raw).to match(/discourse\.rb/)
     end
 
+    it "enables user's email_private_messages option when user emails group" do
+      user = Fabricate(:user, email: "existing@bar.com")
+      user.user_option.update_columns(email_private_messages: false)
+      expect { process(:group_existing_user) }.to change(Topic, :count)
+      user.reload
+      expect(user.user_option.email_private_messages).to eq(true)
+    end
+
     context "with forwarded emails enabled" do
       before { SiteSetting.enable_forwarded_emails = true }
 

spec/fixtures/emails/group_existing_user.eml

@@ -0,0 +1,11 @@
+Return-Path: <existing@bar.com>
+From: Foo Bar <existing@bar.com>
+To: team@bar.com
+Subject: This is a topic to a group from an existing user
+Date: Fri, 15 Jan 2016 00:12:43 +0100
+Message-ID: <32@foo.bar.mail>
+Mime-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: quoted-printable
+
+Hey there, this is an email to a group mailbox from an existing user.