所有发邮件都新开线程

app/models/mailer.rb

@@ -446,7 +446,9 @@ class Mailer < ActionMailer::Base
   
   def self.deliver_mail(mail)
     return false if mail.to.blank? && mail.cc.blank? && mail.bcc.blank?
-    super
+    Thread.new do
+      super
+    end
   end
 
   def self.method_missing(method, *args, &block)