Is there a possibility to select which Internet connection will be used by eM Client (in case there’re more connections on the computer)?
Short answer: No.
Long answer:
In fact that is technically hardly possible. The connections made be every program are routed by the system based on the addresses of the servers the programs connect to and the system routing table [1]. eM Client doesn’t control the routing, the system configuration does.
I should note that the routine table could be adjusted manually using the “route” tool in Windows, so technically it is possible to use specific internet connection, but it is certainly not a good idea to mess with it unless you understand how the network routing works.
many thanks for info, P.