Autoroute SMTP is designed for automatic switching between SMTP servers depending on what network you are currently working in. Autoroute SMTP (ARS) is designed for automatic switching between SMTP servers depending on what network you are currently working in. E.g. you have two Internet service providers - FIRST and SECOND. Normally, IP address authorisation is used for SMTP servers, therefore when you are connected to the FIRST ISP you can send mail to any e-mail address from any e-mail address through his mail server (e.g., SMTP.FIRST.COM). In the same way, having established connection with the SECOND ISP you can freely use its server SMTP.SECOND.COM. But not vice versa.Normally, in that situation user has to get a e-mail address from a free mail server and use its SMTP server to deliver mail, though server of ones ISP ensures much faster and more convenient delivery. The problem is that one has two ISP's. Autoroute SMTP offers solution for that problem. The only thing you have to do is to enter one mail server with address localhost (or 127.0.0.1) in your mail client settings. Then, the mail client will establish connection with Autoroute SMTP, and Autoroute SMTP will automatically switch it to the right server.