Microsoft Outlook and many other popular email clients involves SMTP interpretation They help in improving the performance. Third deals in categorizing different types of mail in order to reduce the ISP blocking. Finally the last feature concerns optimizing and adjusting speed, timeouts, connections and routing options of each domain, as per the policies and preferences of the ISP. The SMTP mail server therefore, in short, takes the entire onus of the mail sending process. By alvarin Public bookmarkswith system:unfiled