I’ve had a bug with the android app where sometimes notifications for emails just don’t happen. I’ve received a new email notification, opened the app, and found that the notification was for an email received 5 hours ago, and I didn’t get any notification for the email 3 days ago or the email 1 hour ago.
Despite this issue and several other minor issues, I still recommend Tuta. Mostly because I can’t find anything better.
I am using Android until I can find an alternative. I’ve turned off all optimisations I can find. I haven’t had the issue in a few weeks, but it did happen once since changing settings. I’m hoping that something random I did (like a phone restart) somehow fixed everything.