VPS Hosting

I use VPS hosting from Westhost, and I have about 12 different domains active on that single IP address. About half of them are my own, and I have various email aliases set up for myself, which all resolve to a single email address, which is the address that I bought my single user postini account for;
1. Once I set up the MX file at West host to the Postini settings, will the "aliases" file and the virtusertable file that I created on the west host server be completely ignored?

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