Within Teamwork Desk, it is possible to remove 'Powered by Teamwork Desk' from your users' and customers' view.
Note: This feature is only available on the Pro plan and above.
Note: You will not be able to remove 'via Teamwork Desk' from any emails sent to customers unless an SMTP server is used for sending replies from Teamwork Desk.
Click on the your profile icon to the top right of the navigation bar and select 'Settings':
In the settings area, go to the 'Company' tab and select 'Edit Company' from the left pane:
Scroll to 'Message Settings' where you will see the option to 'Show Teamwork Branding.'
Disabling this setting will hide any references to Teamwork.com on your Teamwork Desk site.
For more information see: What are the company settings?