<?php

// Autosetup if key is defined in _ss_environment
if (defined('MANDRILL_API_KEY') && MANDRILL_API_KEY !== '') {
    MandrillMailer::setAsMailer(MANDRILL_API_KEY);
}
<?php

// Autosetup if key is defined in _ss_environment or yml
if (defined('MANDRILL_API_KEY') && MANDRILL_API_KEY !== '' || Config::inst()->get('MandrillMailer', 'mandrill_api_key')) {
    MandrillMailer::setAsMailer();
}