Within Teamwork, you can view the failed emails logs in your site settings to check for any issues.
Click on your profile icon in the top right corner of your site, and select Settings from the dropdown menu.
From the Settings area, go to the Email tab. Here, you will see an option to view failed logs at the bottom of the page.
Click the View Logs button to check for any failed emails.
If there are mails within the failed log, please e-mail us through firstname.lastname@example.org detailing the e-mail addresses that have issues and we will 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