You can configure where the users will be redirected after they click on the send button.
The redirection will happen either if the email is successfully sent or if the email is not sent because of a sending error, for example a server misconfiguration. Anyway the redirection will not happen if the user will not fill all fields, because the send button will not work and missing data error messages will be shown.
If Fixed URL redirection is set to No, the users will be redirected to the same page where they have clicked on the send button. Otherwise, if it's set to Yes, you can choose an internal URL of your website to redirect there the users.
In Fixed URL field you must enter an internal URL of your website as destination page after redirection. Please, consider that the module should be published also on the destination page of the redirect, otherwise the email will not be sent.