Within Teamwork, you can use your own site logo in your outbound email notifications.
Click your profile image in the top right corner of your site, and select Settings.
Note: Using your own site logo in your outbound Teamwork email is available for the Pro plan and above.
In the Settings area, go to the Email tab where you will see an option to Use Logo in Notifications.
You can choose to toggle this on to show your own site logo on any email sent from your site.
If you choose to toggle this off then Teamwork branding will be used instead.
Note: Enabling this feature only controls which logo is used. You cannot alter the teamwork.com address used to send the notifications.
For more information, see: Uploading Your Site Logo