Scenario: Company has a Virtualmin VPS that they use to host their website. They want to give a couple of their employees GSuite accounts, and they will use GSuite email (with their domain). For the rest of their employees, and addresses like (firstname.lastname@example.org and email@example.com) they want to use self-hosted email via Webmin/Virtualmin/Whatever webclient they choose.
Is this even possible?
What configuration has to be done to allow them to use Gsuite for some addresses, and self-hosted email for others?