If I set my domain's MX records to google as it said here http://support.google.com/a/bin/answer.py?hl=en&answer=33915 then what address I will have if my domain is mydomain.com and my email on google was myname@gmail.com? Will I have mailbox myname@mydomain.com as a synonim for myname@gmail.com?
Will also any user from google anyuser@gmail.com be able to have address like anyuser@mydomain.com?