Follow Up Boss works with Google's business email service GSuite, @gmail.com and Office 365 email accounts.
Google (our primary recommendation)
Using a Google-based email makes the set up of Follow Up Boss much easier, and also provides the best possible experience for syncing the emails you send and receive related to your leads and clients into your Follow Up Boss account.
It also allows us to provide syncing of appointments with Google Calendar.
Most of our customers have their own domain name, and then set up emails for themselves and their team using the GSuite service.
If your company uses Office 365, you can easily connect your email and sync the back and forth conversations you're having with your leads and clients, see the setup guide here.
GoDaddy / Rackspace
In order to upgrade, you can keep your domain with GoDaddy/Rackspace, and the GSuite service will walk you through some very simple steps to enable the GSuite service with your domain name hosted at GoDaddy.
Yahoo, AOL or anything from a major telecom or cable provider (eg. Comcast)
These providers do not allow third party systems to send marketing emails on your behalf, we do not recommend their use with Follow Up Boss (this is called a DMARC restriction).
This will benefit you in terms of better branding for your business e.g. firstname.lastname@example.org, better software integrations, better spam filtering and better email features in general.
Note: You can point your old email address to your new one so you will not miss any emails.