v1.5.7b php7.3

In composing emails in Admin/Tools/Send Email once sent I am getting the customers first and last name in the email salutation however I am also getting as the next line 'dear customer'. For the life of me I cannot find where to edit this - have tried email_extras.php and email_template_default.html but cannot see where to edit salutation. The FAQ didn't help me.
Would appreciate some help please.

cheers, Mike