Using Multiple Mail Servers through SpoonProxy using Pass Through Ports
You can retrieve mail through as many POP3 servers as you like through SpoonProxy. The easiest way is to use the POP3 Proxy added to SpoonProxy in version 2.4. See the helpfile for details.
Additionally, you can use the TCP map to map these multiple servers. The same holds true for SMTP servers. The key is in how you map the ports.
SpoonProxy can have multiple outgoing ports mapped to port 110 (the default port for POP3) because they are all being mapped to different servers. However, the incoming ports must vary since they are all on one machine.
Here's a screen shot of an example of how you might map 2 POP3 servers and one SMTP server. Note that ports out remain the defaults of 25 and 110.
We recommend using 1110, 2110, 3110 for your incoming POP3 ports simply because they're still easily identifiable as POP3. You can use the same numbering structure for additional SMTP ports (1025, 2025, etc.)
Note: Some SMTP servers do host validation and will only allow mail to be sent from inside certain subnets. If this is the case you may run into trouble sending mail from the client computers. The solution to this problem is to use only one SMTP server for your whole network and choose the SMTP server of the ISP that provides you with your internet connection.