The SMTP addon adds the capability to deliver your newsletters using an SMTP service. Originally the SMTP feature was part of the Newsletter plugin and this addon is perfectly compatibile with that feature and its settings. If you need to use an SMTP to delivery your emails, we suggest to look at some third party plugins which integrate the SMTP delivery at lower level within your WordPress blog. The Newsletter plugin uses those ones seamlessly and you gain the advantage to send all emails from your blog via your chosen SMTP.
