Is there a single command for retrieving a user attribute from Zimbra?

I want to get the zimbraMailHost entry for a user. Currently I can do the following...

zmprov ga username | grep ZimbraMailHost

...and then some string manipulation to get the server name.

I was hoping I could just pass the attribute name to 'zmprov ga' to just get that attribute value but it doesn't work that way. Is there a better way than what I am doing?