There's only a few downsides to Protonmail. It has a pretty small attachment limit and it's not IMAP compliant due to the technology it uses. But the thing that really was a deal breaker for me when it comes to using it as a main source of email is the iPhone app. The app is resource intensive and buggy to the point that it froze my iphone. twice. Both times I had to have a technician restore it to factory settings because it wouldn't even load the OS on a hard reboot.
It shows promise, but it's not quite there yet.
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