The domain status can be changed from active to suspended to prevent access to the domain. When the domain status is set to Suspended, users cannot log in, user email is queued at the MTA, and accounts and distribution lists cannot be created, deleted, or modified.
Go to Configure>Domains and select the domain to be suspended.
In the gear icon, click Edit.
On the General Information page, Status drop down menu select Suspended.
Click Save.
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