FIX: wasn't able to parse FROM email in the embedded email

lib/email/receiver.rb

@@ -244,14 +244,21 @@ module Email
           address_field.decoded
           from_address = address_field.address
           from_display_name = address_field.display_name.try(:to_s)
-          return [from_address.downcase, from_display_name] if from_address["@"]
+          return [from_address&.downcase, from_display_name&.strip] if from_address["@"]
         end
       end
 
-      from_address = mail.from[/<([^>]+)>/, 1]
-      from_display_name = mail.from[/^([^<]+)/, 1]
+      if mail.from[/<[^>]+>/]
+        from_address = mail.from[/<([^>]+)>/, 1]
+        from_display_name = mail.from[/^([^<]+)/, 1]
+      end
 
-      [from_address.downcase, from_display_name]
+      if (from_address.blank? || !from_address["@"]) && mail.from[/\[mailto:[^\]]+\]/]
+        from_address = mail.from[/\[mailto:([^\]]+)\]/, 1]
+        from_display_name = mail.from[/^([^\[]+)/, 1]
+      end
+
+      [from_address&.downcase, from_display_name&.strip]
     end
 
     def subject
@@ -376,6 +383,9 @@ module Email
     def process_forwarded_email(destination, user)
       embedded = Mail.new(@embedded_email_raw)
       email, display_name = parse_from_field(embedded)
+
+      return false if email.blank? || !email["@"]
+
       embedded_user = find_or_create_user(email, display_name)
       raw = try_to_encode(embedded.decoded, "UTF-8").presence || embedded.to_s
       title = embedded.subject.presence || subject
@@ -387,6 +397,7 @@ module Email
                             raw: raw,
                             title: title,
                             archetype: Archetype.private_message,
+                            target_usernames: [user.username],
                             target_group_names: [group.name],
                             is_group_message: true,
                             skip_validations: true,

spec/components/email/receiver_spec.rb

@@ -383,6 +383,32 @@ describe Email::Receiver do
       expect(Post.last.raw).to match(/discourse\.rb/)
     end
 
+    it "handles forwarded emails" do
+      SiteSetting.enable_forwarded_emails = true
+      expect { process(:forwarded_email_1) }.to change(Topic, :count)
+
+      forwarded_post, last_post = *Post.last(2)
+
+      expect(forwarded_post.user.email).to eq("some@one.com")
+      expect(last_post.user.email).to eq("ba@bar.com")
+
+      expect(forwarded_post.raw).to match(/XoXo/)
+      expect(last_post.raw).to match(/can you have a look at this email below/)
+    end
+
+    it "handles weirdly forwarded emails" do
+      SiteSetting.enable_forwarded_emails = true
+      expect { process(:forwarded_email_2) }.to change(Topic, :count)
+
+      forwarded_post, last_post = *Post.last(2)
+
+      expect(forwarded_post.user.email).to eq("some@one.com")
+      expect(last_post.user.email).to eq("ba@bar.com")
+
+      expect(forwarded_post.raw).to match(/XoXo/)
+      expect(last_post.raw).to match(/can you have a look at this email below/)
+    end
+
   end
 
   context "new topic in a category" do

spec/fixtures/emails/forwarded_email_1.eml

@@ -0,0 +1,18 @@
+Message-ID: <58@foo.bar.mail>
+From: Ba Bar <ba@bar.com>
+To: Team <team@bar.com>
+Date: Mon, 1 Dec 2016 13:37:42 +0100
+Subject: FW: Discoursing much?
+
+@team, can you have a look at this email below?
+
+From: Some One <some@one.com>
+To: Ba Bar <ba@bar.com>
+Date: Mon, 1 Dec 2016 00:13:37 +0100
+Subject: Discoursing much?
+
+Hello Ba Bar,
+
+Discoursing much today?
+
+XoXo

spec/fixtures/emails/forwarded_email_2.eml

@@ -0,0 +1,18 @@
+Message-ID: <59@foo.bar.mail>
+From: Ba Bar <ba@bar.com>
+To: Team <team@bar.com>
+Date: Mon, 1 Dec 2016 13:37:42 +0100
+Subject: Re: Discoursing much?
+
+@team, can you have a look at this email below?
+
+From: Some One [mailto:some@one.com]
+To: Ba Bar <ba@bar.com>
+Date: Mon, 1 Dec 2016 00:13:37 +0100
+Subject: Discoursing much?
+
+Hello Ba Bar,
+
+Discoursing much today?
+
+XoXo