A script for finding vulnerable versions of PHPMailer on a server:
https://gist.github.com/cebe/d0f5631b432c520a2e6f6be8beddf11...
Finds also really old versions like 2.0.4.
find /var/www -name 'class.phpmailer.php' -print -exec grep -ni '%s["'\''], $this->Sender' {} \;