Setup HTC Phones for GAPPS

In the HTC email app setup a new account for the GMail

Incoming...
Protocol = IMAP
Email Addr =  This e-mail address is being protected from spambots. You need JavaScript enabled to view it.  (or whatever yours is)
Username =  This e-mail address is being protected from spambots. You need JavaScript enabled to view it.
Password = <your password>
IMAP Server = imap.gmail.com
Security Type = SSL
Server Port = 993

Outgoing...

Login required = Tick
Password = <your password>
SMTP Server = smtp.gmail.com
Security Type = SSL
Server port = 465

NOTE: If you don't want the GMail to be pulled on the main account then you can disable that

Menu>

Accounts&Settings>

Google>

Sync Google Mail