[exim] Silly Question about "To: " manipulation...

If someone sends Email to a multi-user alias, like sales-team@???,
I use (as many do) an alias to get it delivered. However, I was
wondering if it were possible (or even advisable) to devise a way to
modify the To: line with the expanded names (though, not necessarily the
full Email addresses).

In that
To: CorVu Sales Team <sales-team@???>
Might change to
To: "Bob, Mark, Mike, Sarah, Keith" <sales-team@???>

As most ideas like this usually have valid reasons to NOT do it, I
figure this probably has such a reason as well. Suggestions?
Recommendations?

Thanks,
Gary Allen