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 compatible with that feature and its settings.
Is Newsletter - SMTP Addon 1.1.7 GPL and safe to use?
Yes. All plugins and Themes on WPBoostly are 100% GPL-licensed and safe for use on your WordPress site. No license keys are needed for functionality.
