Hook
tkt_sei_email_subject
You can use the filter tkt_sei_email_subject
in order to customize the “About” of the Email sent with the TukuToi Send Email If Plugin.
You just need to return a valid Email “About” (string) in the callback function like in the below example.
add_filter('tkt_sei_email_subject', 'my_custom_email_subject'); function my_custom_email_subject(){$subject ='My Custom About';
return $subject;
}