Web Mail May Not Work Within A Frameset
Web Mail end-user self-registration (i.e. Signup Now) may not work within a frameset when viewed by Microsoft Internet Explorer for Windows. It will appear that the new user is stuck on a step of the registration process.
If your intent is to use a frame to obscure the Web Mail service URL, please use a CNAME instead:
A CNAME allows you to have a fully-branded Web Mail URL and avoids an unnecessary frameset that may affect browser performance.