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Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.
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only if the A record resolves to that, which i highly doubt
use the hostname exch028.serverdata.net
if all of the outgoing server names match their MX records for receiving mail, you can just specify mx in your spf definition that way 1) you don't have to manually add all the addresses and 2) if they change something, you won't need to change your entry