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Which email app are you using? It's possible in the gmail one for sure, just look in the settings. I'd imagine every email app will have a setting for this though, have a look.
If you go to the 1st sticky post on this forum, it will tell you how to add more notifications, alarms & ringtones
Put the sound you want to use (mp3) in your notification folder, go to messages, open "Menu" select settings/select sound, anything you place into the notifications folder will be shown as a selection. If you don't see it you haven't done it right, or your connected to your PC.
Same goes for the email, I just checked mine and changed it, - edited my post
I use Googlemail, I didn't think it would be that different, sorry if I mislead you.
You can use seperate notification tones for everything: email, sms, facebook, twitter and so on. Just look for the option in the respective app.
So it's odd there isn't one in the HTC mail app. I'd have a look but I dont have that app on mine any more.