From the local Windows Mobile team blog:

“The HTC Snap has been out for a while now through Telstra. The default configuration is set to take advantage of the new flat rate data plans – know as Microsoft Mobile Enterprise Solution (MMES) http://www.telstraenterprise.com/productsservices/mobility/officemobility/Pages/MicrosoftMobileEnterpriseSolution.aspx

We’ve been hearing that some customers are experiencing “difficulty” in setting up e-mail with the SNAP, so here’s the guide to getting Exchange ActiveSync setup if you’re not on the new Telstra plans (MMES).”

Continued here:

http://blogs.msdn.com/wmoz/archive/2009/09/17/htc-snap-activesync-setup-if-not-on-telstra-mmes-plans.aspx