The only template that will work with iMail (without modification) is the “Standard” template. We did consider this when designing the new system and any user sending via iMail will see a warning and a shaded red box as a way to verify that the recipient address position is compatible with iMail.
I will add some clarification to our help file on this matter today, I’ll also add some additional notes on the debugging tools John mentioned. If you’d like to use one of the other styles and retain usage of the iMail service you could always reposition the address. I’m happy to advise on how this can be done.