I've seen some posts on how to use apache to proxy to zimbra.
Problem is all the examples I've seen are:

url.com: Search with Many ---> http://inside.zimbra.com
ie. There is a mapping starting at the base.

What I'm looking to do is this:

http://outside.url.com/mail --> http://inside.zimbra.com

I've tried to use some of the examples I've seen, but I either get errors on login(or checking mail .. which I found are because other URLs need to be mapped /service, /home, etc) and some images no longer show up.

I've also tried changing the ZimbraMailUrl to /mail to see if this helps at all .. not luck.

any ideas?