We want to have SMTP gateway. Powermta will be set up Smtp gateway in front of the server and will be given a special port. This gateway will accept inbound email via SMTP. Will need the username and password to connect to the server. Gateway will check incoming email blacklist. Incoming mails will be made on the changes in format and headers. Add it to a private headers. Attract them to a separate file. (Example: Reply-to: - X-Mailer: - Sender: - References: - Errors-to: ) Outgoing all emails formats MIME Message, Multipart / will be appropriately alternetive. Gateway needs to be very fast. 20 million, the average number of e-mail blacklist. There is e-mail traffic of 9 million per day per server. After action completion of emails, sent to mail the real smtp server.