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Socket connection on VPN plus Proxy server

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Hi to all!
At my work place we have a proxy server and on each machine we have a proxy client. With everything enabled, I can send emails and connect to sockets on Internet without any problems.
However, we are now switching to opening the sockets on a VPN; I have found that for this to properly work, I must disable the local proxy client, otherwise the default gateway will try to resolve the IP specified in the VPN connection. Disabling the proxy client will prohibit me from sending email with java mail.
I tried adding -DproxySet=true -DproxyHost=myProxyHost -DproxyPort=myProxyPort, with no effect. I read that I can also use socksProxyHost and socksProxyPort properties, but this will affect all TCP connection and also my sockets connections too...

Is there any work around to this mess? Basically I want the socket to be opened using the VPN but the mail to be sent using the default gateway; can this be achieved on the same JVM?

Best regards
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