Is it possible to use our own domain name to send forms?

Additional is it possible to use our own domain name to send forms, if so how does this work?

If you are asking about a custom sender email, that is possible. We recommend the SMTP method:

https://www.jotform.com/help/244-How-to-Setup-SMTP-for-a-Form

If you are asking how you can have a custom domain on form URLs, that is possible by configuring a CNAME record to your hosting:

https://www.jotform.com/help/144-How-to-use-Custom-Domains-with-Jotform

Note that we currently do not support HTTPS on a custom domain, so if you have a payment in forms, this will not work as your users will get a prompt that the form is not secure.