I like that it's easy to use with multiple users from different platforms (mobile/desktop). It was pretty hard at first getting used to using auth smtpmailer but once you do everything works smoothly! The only thing about this software which could make me dislike would be if they added more features such as adding attachments in emails etc., however these are things we can add ourselves so not much of an issue there.- Easy setup - Easily configurable via API / CLI interfaceI'm solving my problems by being able to send bulk mailings quickly without waiting days between each one. I like how easy it is to use and customize. The customer support is great as well! It's super cheap compared to other providers. Their support can be slow sometimes but that doesn't mean you're doing something wrong. I've used several different providers over the years and Authsmtp has been by far my best experience thus far. They have helped me with all of my needs in regards to sending out emails from my site.