UsageParametersSource
The 「gform_html_message_template_pre_send_email」 filter in Gravity Forms allows the template for the HTML-formatted message to be overridden.
Usage
123456789101112131415add_filter( 'gform_html_message_template_pre_send_email', 'notification_template' ); function notification_template( $template ) { $template = '
Parameters
$template
string
The template for the html formatted message. Use {message} and {subject} as placeholders.
Source
common.php