This is a very common technique among email validation providers. There is an issue with sending emails to the email address to check for validity. When the server is set to “catch-all”, it means it will accept all emails and will not bounce back. This will signify that the email is valid. But that isn’t true. It just means this server will accept all emails without sending ping-backs, even though the email doesn’t exist. At Find That Email we don’t use this technique, our powerful algorithms go through twenty different data sets to verify the validity of the email address. This ensures a much more accurate result and also in all cases retrieves a result.