Email Server and Web Server in two different locations?

I am a web developer who has developed a set of content management tools. The way i have things set up now the web site has to be hosted on my server in order to use the content management tools.

I have a client that hosts their email and web site on site. Is there a way that they can still host their own email on site and have the web site hosted on my system? What would they need to do to point web site users to my server and still have emails handled by their email server?

Is there a better way?

 

 

 

 

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