Out of the box vTiger comes with few email notifications already enabled. The notifications are triggered when: Opportunity is created Trouble Ticket has been updated from Customer Portal Trouble Ticket has been created from Customer Portal New Comment has been added to the Trouble Ticket These notifications are triggered by vTiger workflow. To turn the notifications off, you would do: Mouse over the “gear” icon on the right upper corner Click “CRM Settings” Under “Other Settings” click “Workflow“ Click on the Workflow you want to disable Scroll down to “Tasks” section and modify the Task Once the task opens, set the “Status” to “Inactive” and save the task.