There is a helpdesk setting which requires the end user to confirm a ticket they submitted (via their email). This acts as a spam catch.
The main setting is managed in `Admin Settings > Helpdesk Configuration`. Scroll down until you see the "Tickets Pending Confirmation" section.
When this is turned ON, the end user is required to confirm their ticket, meaning their ticket will not be created automatically in the helpdesk. Rather these tickets will sit in the `Pending Confirmation` until they are confirmed by the user.
Alternatively, Agents can check view and confirm these tickets internally. Click on `Unassigned Tickets` and then on the upper right you will see a `Pending Confirmation List`. If desired, agents can go through the pending list, and confirm any legit tickets.
This is one of the many ways Mojo prevents spam in your helpdesk.