Are there optiosn to use domain instead of jotform.com in the custom URL

Are there options (like for sender of autoresponder emails) to use another domain instead of jotform.com in the custom url?

If you want to use a custom domain name to your form, you need to update upgrade to Enterprise level. Here's a guide: https://www.jotform.com/help/144-How-to-Use-Custom-Domains-with-JotForm-Enterprise

If you're referring to the autoresponder email, you can change the Sender Email by following this guide: https://www.jotform.com/help/238-How-to-Add-a-Custom-Sender-Address-to-an-Email-Alert

Please try it and let us know if you need further help. Thank you.