> ## Documentation Index
> Fetch the complete documentation index at: https://coss-mintlify-7c00cc7c.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Require/Exclude Email Domains (Booking Question)

> Control who can book by requiring or excluding specific email domains like @company.com or public domains like @gmail.com.

The **Email** field in Cal.com’s booking questions supports **domain-level restrictions**, allowing you to control who can (or can't) book time with you based on their email address.

### Use Case

This is useful when:

* You only want people from a specific company (e.g., `@company.com`) to book.
* You want to **exclude free/public domains** like `@gmail.com` or `@yahoo.com`.
* You're running internal meetings and only want your organization's members to access them.

### How to Configure

Go to your Booking form settings of your Event type setup. Under \*\*Booking questions, \*\*find the Email field. Click on `Edit`next to the booking question, and you’ll see options to:

* Require emails that contain (...)
* Exclude emails that contain (...)

Simply use the fields to specify or exclude email domains for your specific use case.