Email queues can be set to accept emails from registered users only. When the setting is enabled, non-registered users will be prompted to register at the support center first before they are allowed to send emails to that queue. This setting helps fight spam emails.
This article provides instructions on how to set the email queue to accept emails from registered users only.
Sign in to Kayako and go to the admin area.
Go to Email Parser and click on Email Queues.
Click on the email queue address you want to configure, example:
Click the Ticket Options tab.
In the 'Registration required' section, select Yes.
Click Update to save the changes.