Reconfigures the wp_mail() function to use SMTP instead of mail() and creates an options page to manage the settings.
This is a good options if you just want to simply enable SMTP and not really worry about anything else.
The main reason I would not use this plugin is because it doesn't encrypt SMTP Auth Information. It leaves it in plain text in the WP admin interface as well as in the DB.
If that doesn't matter to you this is a good option.