This is not a problem, if you wish to use an exchange server or other mail provider we can point the mail records to that provider. All you need to do is contact Support either by email: support@websiteforge.com, by Phone: 1-888-558-2446 x2 or create a ticket and supply us with the I/P address of your new mail provider or exchange server and all of your contact info.
Once we make those changes we will notify you and ask you to confirm the changes.
Also see details here about DNS settings.
Currently we do not have a DNS manager for users to make these changes on their own. But we are happy to make any changes like this for you.