In case if you have some problems with sending notifications (or emails) after user registration or you get a 500 Internal Server Error and Error Log:

“malformed header from script. Bad header=More than one “from” person: php, referer: link_name”,

For Joomla users: open the phpmailer file (it is located in the following directory):

/www/Domain_name/libraries/phpmailer
and make changes in the following line:

$params = sprintf(“-oi -f %s”, $this->Sender);

change to

$params = sprintf(“”, $this->Sender);

For Prestashop users:
open php.ini (php-bin folder) and remove the fifth parametr

(-f vash_email@email.com) and change to: sendmail_path = “/usr/sbin/sendmail -t -i”.