Email verification is one of the most effective ways to reduce spam and fake bookings — it blocks bots and bad actors who use non-existent addresses before they ever reach your calendar.
Why use “Requires booker email verification”?
- Eliminate Spam & Fake Bookings: It prevents bots or malicious users from filling your calendar with fake appointments using non-existent email addresses.
- Ensure Deliverability: By verifying the email upfront, you can be 100% certain that confirmation links, meeting invites, and automated reminders will actually reach the guest.
- Protect Sensitive Meetings: For high-value consultations or private sessions, this ensures that the person booking is exactly who they claim to be.
- Reduce No-Shows: Requiring an extra step of verification often filters out casual or “low-intent” bookers, ensuring your time is spent with committed clients.
How to set it up
1
Log in to Cal ID
Log in to your Cal ID account.
2
Select your event
Go to the Event Types tab in the left sidebar and select the specific event you wish to modify.
3
Navigate to Advanced
Click on the Advanced tab in the top navigation bar.
4
Toggle the Setting
Scroll down to find the option Requires booker email verification.
5
Enable
Switch the toggle to ON.
6
Save
Click the blue Save button at the top right to finalize the change.

How it works for the booker
- The Verification Step: After the guest fills out their name and answers your booking questions, they won’t see the “Confirmed” screen immediately. Instead, they will see a prompt to enter a 6-digit verification code.
- The Email Trigger: Cal ID instantly sends an automated email to the address provided by the guest containing the unique code.
- The Confirmation: Once the guest enters the correct code on the booking page, the meeting is officially confirmed and added to both of your calendars.
- Time Sensitivity: If the guest fails to enter the code within a certain timeframe, the slot remains open for others to book, protecting your availability.
While this feature significantly increases security, it does add a small amount of “friction” to the booking process. We recommend using this for high-value or public-facing links where spam is a concern. For known clients or internal team meetings, you may prefer to keep it disabled for a faster booking experience.