Hello

the recent security update of PHP mailer -a third party script included in many CMS- led us to release quickly 2.8.4 and 2.8.5. Unfortunately we couldn't properly test the changes due to the emergency of the critical flaw.

So there is still a remaining bug for people using a custom SMTP config in Piwigo: the message is Fatal error: Class 'SMTP' not found

How to fix it:

In your Piwigo installation folder, edit file include/functions_mail.php.
In line 610 replace "class.phpmailer.php" with "PHPMailerAutoload.php" so it now looks like:

include_once(PHPWG_ROOT_PATH.'include/phpmailer/PHPMailerAutoload.php');