Enabling automatic user creation To enable the automatic creation of user records from email, you must set two email properties. Procedure Navigate to System Properties > Email. Select the check box for Automatically create users for incoming email from trusted domains (glide.pop3readerjob.create_caller). Enter the list of trusted domains in Trusted domains for creating users from incoming emails (glide.user.trusted_domain). Note: The glide.user.trusted_domain property only prevents user creation if the sender is not from a trusted domain. The system processes the inbound actions of the email as a "guest user". If you want the system to ignore these email messages, use the email filters plugin, specifically the "ignore sender" setting, or lock the guest user. Click Save. What to do next Note: When the property glide.pop3readerjob.create_caller is set to false, the instance runs inbound actions from users who do not match an existing user by impersonating the Guest user. When the property glide.pop3readerjob.create_caller is set to false, the instance runs inbound actions from users who do not match an existing user by impersonating Guest user. You may want to prevent untrusted users from triggering inbound actions by locking out the Guest user.