can i use google (gmail) AND self hosted email

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http://forums.cpanel.net – This is probably a stupid question so I apologize up front. Email is not my area of expertise and I do quite a bit of hacking around to get stuff done. I would like to use google's email for some email accounts on a particular domain. HOWEVER I'd like to have the majority of the email accounts serviced through the server's own hosted email system so that the users can use SugarCRM. Hopefully that makes sense? Wondering if I need to just have ALL the domain's mail using the onboard server's smtp (I'm assuming there is one), and then whoever wants to do their email primarily through gma (HowTos)