Echoing that other thread ( SaneBox vs Really Great Mail Rules ) I have subscribed to SaneBox and gave it a serious try; I was even ready to push all my email systems to it, especially snoozing and reminders, but… as soon as I tried using seriously the snooze folders, emails would regularly vanish completely from the server instead of reappearing.
No trace on the server, nothing, and it is not a mistake on my part – I have extensively debugged the issue with my mail provider, with screenshots of my folders, of my messages, and the fact remained – messages just plain disappeared. Thinking the mail provider was at fault, I have moved to Fastmail thanks to the great advice here (thank you again: love it!), and the problem presented itself again.
Of course, I have contacted the SaneBox support but they couldn’t solve it (and honestly, as it happens of course, I couldn’t reproduce it with a handful of self-addressed test emails). My request was taken a bit lightly to be honest, I had to explain myself several times, I was asked to send them message headers from an iPad (Apple Mail does not provide that feature or iOS), and so on.
I am not bashing SaneBox, I know many people here who love it, including our great MacSparky, and it works fine for many of you, but I have lost a few valuable and important messages during that ill-fated SaneBox experiment and thought I would share the feedback for possible future users. I’ve now landed on Spark and even if it is not perfect, it is as close to it as I have yet to see an email app be, and I will now be staying away from SaneBox beyond the SaneLater folder (and I am thinking to replace it as well with email rules).