Hi :-)

in local config file

// smtp configuration (work if fsockopen function is allowed for smtp port)
// smtp_host: smtp server host
//  if null, regular mail function is used
//   format: hoststring[:port]
//   exemple: smtp.pwg.net:21
// smtp_user/smtp_password: user & password for smtp identication
$conf['smtp_host'] = '';
$conf['smtp_user'] = '';
$conf['smtp_password'] = '';

// 'ssl' or 'tls'
$conf['smtp_secure'] = null;