
Easy to set up and use, very straight to the point UX, spam control can be done via API, which is great for people who takes seriously the spam in HTML mails. It has LOTS of email clients, honestly you can't blame them for not having any client (except the browser of your smart fridge or something like that). Review collected by and hosted on G2.com.
It's not fancy at all and at first seems like an outdated or "made by one person project". For the occasional user, maybe a smaller fee without API could be a good selling point. Review collected by and hosted on G2.com.