Within Teamwork.com, you can view the failed emails logs in your site settings to check for any issues.
Click your profile icon in the bottom left corner of your site and select Settings from the pop-out menu.
In the settings area, go to the Email tab where you will see a Failed Log section.
Click the View Logs button to check for any failed emails. Hover over the Detail field to see the associated recipient, sender, and subject.
Please contact us at support@teamwork.com detailing any affected email addresses in order for us to remove them from the listing.
Note: Only site administrators in the owner company have access to the site settings.
For more information, see: Resolving Email Notification Issues