Users-> Modify User-> User Preferences Tab-> Email Tab. All email options use the CenPoint email form to compose your email, default in recipients (i.e., Billing contacts, quote prepared for, etc.) attach documents etc. The only thing that changes is how it sends behind the scenes. Emails are logged according to your branch settings.
Gmail Authentication
Click the hamburger menu on the top right of CenPoint
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Go to User Preferences
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Scroll down to just about halfway. There will be a section for email

Select Gmail, enter your email and click the Sign in with Google

Select or add the Gmail account
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Click Continue
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Check the box 'Send email on your behalf' and click Continue.
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A browser will launch to notify you if CenPoint has successfully connected with your Google account.
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