Suppress images for short emails

lib/email/sender.rb

@@ -94,6 +94,12 @@ module Email
       @message.header['X-Discourse-Post-Id'] = nil
       @message.header['X-Discourse-Reply-Key'] = nil
 
+      # Suppress images from short emails
+      if SiteSetting.strip_images_from_short_emails && @message.html_part.body.to_s.bytesize <= SiteSetting.short_email_length && @message.html_part.body =~ /<img[^>]+>/
+        style = Email::Styles.new(@message.html_part.body.to_s)
+        @message.html_part.body = style.strip_avatars_and_emojis
+      end
+
       begin
         @message.deliver
       rescue *SMTP_CLIENT_ERRORS => e

lib/email/styles.rb

@@ -137,6 +137,19 @@ module Email
       end
     end
 
+    def strip_avatars_and_emojis
+      @fragment.css('img').each do |img|
+        if img['src'] =~ /user_avatar/
+          img.remove
+        end
+
+        if img['src'] =~ /plugins\/emoji/
+          img.replace img['title']
+        end
+      end
+      return @fragment.to_s
+    end
+
     private
 
     def replace_relative_urls