From admin console → Users
Then delete admin user:
From admin console → Apps:
Go to “Marketplace apps”:
Delete 2 apps:
From admin console → Groups:
Delete 4 proups:
From search line go to “compliance”:
In this page, you will have a few rules to delete.
Note - don't forget to save your changes after deleting the rules.
content compliance - You should delete 4 rules (or 3 if you don't have an inline rule).
SMTP rule:
Inbound gateway:
From search line go to “hosts”:
Then From “Hosts” row and delete the host rule:
