Users can be suspended, which means that they are no longer able to sign in to your Zendesk and any new support requests you receive from the user are sent to the suspended tickets queue. This can be done by either marking tickets as spam, which deletes the ticket and suspends the user at the same time, or by marking the user as suspended in their user profile. Agents can suspend end-users and administrators can suspend both end-users and agents.
Users are not notified that they have been suspended, they simply cannot sign in anymore. You can unsuspend users, which restores their previous login credentials and access privileges.
To suspend a user
Click the Search icon () in the sidebar.
Zendesk Classic: The search field is in the upper-right of the top toolbar.
Enter the name of the user you want to suspend in the search box and click the user's name when it appears.
Alternatively, you can open a user's profile from one of their tickets.
Click User options in the bottom toolbar, then select Suspend access.
Zendesk Classic: Select Actions > Suspend access.
Suspended users are flagged as such and they can no longer sign in. Any new support requests received from the user's registered identities (email addresses, Twitter, etc.) are added to the suspended tickets queue. You can manually release or delete their suspended tickets.
To unsuspend a user, follow the steps above and select Unsuspend access.