G Suite Gmail includes these key features to help administrators manage access to Gmail and the flow of email for their organizations:
|Custom URL||Specify a custom URL at which your users access Gmail -- for example, mail.your domain.com||Learn more|
|Email whitelist *||Specify IP addresses from which your users expect to receive legitimate email. Messages from addresses on your whitelist won't be marked as spam.||Learn more|
|Email routing *||Specify where inbound messages are delivered, for purposes such as G Suite pilot deployments, mail server coexistence, and archiving. You can route messages to a catch-all address or another mail server.||Learn more|
|Inbound gateway *||Use an SMTP server to route inbound messages to users at your domain, for purposes such as archiving, filtering, monitoring, and compliance.||Learn more|
|Outbound gateway *
||Route outbound messages from users at your domain to an SMTP server for purposes such as archiving, filtering, monitoring, and compliance.||Learn more|
|Outbound relay||Allow users to send outbound messages with a different "from" address, through an external SMTP server on which they have an account.||Learn more|
* Available with G Suite Basic, Business, and Enterprise editions.
Note: Administrators can also turn on Gmail options for users, such as Advanced settings, offline Gmail, POP and IMAP access, mail delegation, and more. See Gmail options for users.