One code is for one program. If your computers are connected a LAN, you can just use one QK. Please refer to the following:

First, the local SMTP Server should have an IP address or a domain name which can be accessed, moreover you should have a SMTP Server port which the local firewall allows to access;

Second, SMTP Server don't deny others' access.

127.0.0.1 is always the local address, you can't use it to access other computer. If you want to access the local host, you should remember the IP address or the domain name on the internet for the local host.

Moreover, QK SMTP Server' s default configuration only allow the local IP access. So, when you use it on the road, you should add an IP address which others can access, in Settings -> Access IP Control. If you don' t know this IP address, you can choose ' IP address not in
table ' to ALLOW. Considering the safty you can add a account and password in order to make the QK SMTP Server needs verify.

Here is an example. QK is installed on the server
(the IP of server is: 166.168.0.119). A computer "D" (IP of D: 166.168.0.9) want to access and use QK. The configuration of server is: allowing the IP 166.168.0.9 to access. The configuration of "D" is: the SMTP address changes to the IP of server 166.168.0.119 ( not the default one --- 127.0.0.1 and this is uesed in the server).

If your computers are two independent ones, I am sorry to say you should have two qk.