The maximum length for the custom content added to notification and reminder emails has been increased from 500 to 2000 characters.
You can customize the email body using the following parameters:
email_notification.custom_note
in the Signature Request creation or update endpoint.custom_text.request_body
andrequest_body.reminder_body
in the Signer creation or update endpoint.
Those changes are also available for Signature Requests created on our web application.
More details on customizing email content can be found in our guide section.