Adding another network card to send email throught another network

We need to send emails from an application in a server  that it is not connected to the internet  or any other network. The network of this server is 192.168.0.0 /24 (first network card). This server has another network card.  We thougth of configuring the second network card  and connect it to a network (10.140.0.0/24) that has a path to send emails. The 10.140.0.0/24 network does not route 192.168.0.0/24 and we can't change it. By configuring the second network card can the application  send emails through the second network? can this work?
ShenAsked:
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Andy SCommented:
yes, that should be able to work. setup the routes so that the app server can resolve either the DNS or use a relay that it knows about there should be no issues. make sure that DNS for the internal mail is still pointing to the 192.168.0/24 network or it may try and send everything external

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ShenAuthor Commented:
thanks,
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