Teamlist uses a system for detecting bounce messages. This gives you some feedback about which email addresses on your lists are invalid. Because bounce messages are not standardised, we have to use a best guess, with special care to avoid false positives.

When a bad email address is detected, the email status field changes to “bounced”. The email address is also displayed with a strikeout through it on the spreadsheet report.

In the past you would also have received a “Bounce action notification” email, but this proved annoying for large lists. As of today you will not receive those notification emails anymore.