The catch all or default email address receives emails sent to an invalid or non-existent email address and can redirect them to another mailbox or to a ‘pipe’.
For example, if you have only two email addresses – email1@yourdomain.com and email2@yourdomain.com but someone sends an email to email3@yourdomain.com, then your catch all email will receive this email.
If you do not have catch all enabled, any email sent to an invalid address will get bounced.
