Disabling return-path headers is essential if your organisation uses a mail provider like G Suite and often required in Microsoft 365 environments.
If you find your phishing emails are arriving with "via tacklephishing.com" in the 'From' field, checking this box will stop this from happening.
- Under Setup in the left-hand column click "Organisation".
- Click "Settings".
- Click "Email Sending".
- Check the Disable "return-path" header box.
- Click "Save".
This will allow mail to show the correct information in the From Address, no longer showing "Via tacklephishing.com".