You can't send an email to one customer through Hakema. but you can invite a customer to your Booking Page.

Also in Hakema you can your default email program (like Gmail or Outlook) from the customer profile to send email.  To do so:

On the Customers Page, go to Search function and find a customer by name. (see Finding a customer)

Click on the customer’s email address. (see below)

An email draft will open in your default email program.