I've got a Joomla 1.5 site, for signing up user in site make it possible for the e-mail delivering system's, set up the smtp server in joomla configuration. my config is:
mailer:'smtp server' smtp host:'smtp.gmail.com' smtp user:'firstname.lastname@example.org' smtp psw:'mypass' smtp port:'465' smtp authentication:'yes' smtp security:'ssl'
I'm not sure becuase doesn't work which is worth observing that php mail function dosen't work!
uncomment "extension=php_openssl.dll" inside your php.ini file
add exception for port 465