We are using gmail, changed from SMTP to SMTP with TLS and port 587 but I also have had to do this changes:   In the file /classes/mailer.class.php, find near line 39: $this->Port = $GLOBALS['config']->get('config', 'email_smtp_port');   After that line, add the following on a new line: switch($this->Port){case 465:$this->SMTPSecure = 'ssl';break;case 587:$this->SMTPSecure = 'tls';} This fix was sent to me from a colleague and looks like is working