Restrict Your Business Email within Your Organization
As an admin, you can restrict emails between certain users or user groups in your organizations to maintain the confidentiality of your internal data.
As a G Suite administrator, you might want to restrict emails between certain users or user groups in your organizations. For example, you might want to prevent the sales team from sending email to the marketing team.
You set this by creating one compliance rule for the sender and one for the recipient.
Create Sending Rules:
To create a sending rule for certain users, you need to put those users in an organizational unit, for example, Sales.
You have to go to Admin Console via admin.google.com
From Admin Console home page you need to go to Apps> G Suite> Gmail> Advanced Settings
On the left, you can find the organizational unit. You need to select the particular Organizational unit of the users that you want to apply the sending rule to, such as Sales.
Scroll to the Compliance section, in Content compliance setting you need to choose an option: Edit or Add another as per your need.
You have to add or update the description for the rule.
Under Email messages to affect, you need to check the checkbox of Outbound and Internal - sending to create the sending rules.
If the above expressions match, you need to select Modify message from the drop-down menu.
You can also add the header as per your need.
Click Add Settings and then Save.
Create Receiving Rules:
To create a receiving rule for certain users, you need to put those users in an organizational unit, for example Marketing.
You have to go to Admin Console via admin.google.com
From Admin Console home page you need to go to Apps> G Suite> Gmail> Advanced Settings
On the left, you can find the organizational unit. You need to select the particular Organizational unit of the users that you want to apply the sending rule to, such as Marketing.
Scroll to the Compliance section, in Content compliance setting you need to choose an option: Edit or Add another as per your need.
You have to add or update the description for the rule.
Under Email messages to affect, you need to check the checkbox of Inbound and Internal - receiving to create the sending rules.
If the above expressions match, you need to select Modify message from the drop-down menu.
You can also add the header as per your need.
Click Add Settings and then Save.
