info.mailtraq.com > Outgoing Mail > SOCKS Proxy Client SOCKS Proxy ClientThe SOCKS client enables an alternate method of outbound message delivery. 
The SOCKS client enables messages to be sent via a remote SOCKS proxy server, typically on port 1080 so that outbound email can avoid blocked Port 25 for SMTP delivery. SOCKS Server The client must, of course, connect to a Server 'outside' the controlled space. You can find a list of Proxy Servers here... A second instance of Mailtraq can also be configured to be a SOCKS Proxy Server Operation The Proxy is only available if the [x] Enable Advanced Outbound Router | 
