If you are not receiving emails this could be due to many different reasons. To make sure this is not an issue with the settings that you're using, consider going to this page and check your Domain's MX record value there.
In MX Records value you should see default Hostinger MX records. If you see a different value, you need to change it in your website's hPanel, in the Edit MX Record menu. You can easily reset your MX records to defaults and everything should start working again in the next 24 hours.
NOTE: If your MX records are correct, you are not receiving any emails both on Webmail and external email clients, don't hesitate to contact us directly via Live Support for further help with your email issue :)