Hi ​@Ark47018, at this time Calendly does not support sending confirmation emails directly from your own custom domain (e.g., yourname@yourwebsite-dot-com) as the "From" address. The sender will always be notifications@calendly.com for deliverability and anti-spam reasons.

You can, however, change your reply-to address by updating your Calendly account email. Just be careful that this won’t affect your connected calendar. To do this go to your Calendly login preferences in your account settings. Change your login email to your desired website domain email (e.g., yourname@yourwebsite-dot-com). Be sure to save your changes.

Additionally, you can set up a workflow which will come from your email. However, the initial notification that a meeting has been set will still come from notifications@calendly.com. More on setting up Workflows here