The solution I had before was using a spam filter I couldn't control. Now and then some legitimate emails slipped through. I had looked at other solution but most were total overkill for a solo company like mine.

I used a secondary email to test DoneDone before purchase. Setting up DoneDone was super easy. The interface can be learned in a couple of minutes.

Because I used another email for testing I had some problems with combining what I had set up with the email from AppSumo. The support was fast and helpful.