Editing E-Mail Addresses

I'm creating a function to determine if an e-mail address is syntactically
correct and that its domain can handle e-mail.  I found Scott Klement's
excellent code for this at the following link:
http://www.iseriesnetwork.com/resources/clubtech/index.cfm?fuseaction=ShowNe
wsletterIssue&ID=17632

I've noticed, however, that this function assumes a domain name is okay if
it exists, even though it may not be able to handle e-mail.  An example is
test.com, where the e-mail addresses are actually testcentral.com.
Presumably, mail sent to the test.com address would be rejected.

I modified the code slightly to always search for a mail exchanger and that
seems to work except for our own domain (roomstore.com).  

Would one of you kind folks set me straight as to how this stuff is supposed
to work?  I'm obviously not understanding this very well.

Thanks. 

Donald R. Fisher, III
Project Manager
Roomstore Furniture Company
(804) 784-7600 extension 2124
DFisher@xxxxxxxxxxxxx