The Simple SMTP Mailer plugin allows you to easily configure WordPress to use SMTP instead of the PHP mail function.
This should only really be used in a development environment.
All settings can be overridden by assigning array values to the SSMTP_MAILER constant in wp-config.php. This is useful for automating local deployment.
define(
'SSMTP_MAILER',
array(
'host' => emailhost.com,
'username' => username,
'password' => password,
'port' => 25,
'security' => 'SSL'
)
);