Hi Swapz,
You can achieve this by separating domains in address areas of SMTP nodes. Something like below...
*@abc.com
*@efg.com
emails to go from company1.com i.e SMTP1 node of SCOT
and
*@lmn.com
*@xyz.com
emails to go from company2.com i.e SMTP2 node of SCOT
Regards,
Prithviraj.