DNS rewrite

[Yiannis]

Is DNS rewrite supported on the MX appliances?

If not is there any workaround?

[Bruce]

Not that I know of. What are you trying achieve?

[KarstenI]

The typical workaround (which I also always prefer to DNS rewrite) is to place your own DNS-resolvers in a DMZ and use these.

But first, tell us what exactly you want to achieve. as there are different solutions based on use-cases.