This has never happened to me before, but yesterday I opened a big thread with emails in my mail app (~ 60 emails) and I do not know how, but today they are gone. That happened in my office
All e-mails my customer and I have exchanged in the past 3 months have simply disappeared without my consent.
I tried to search them through the Round Cube directly on the server, and they do not exist (not even in the Trash, Junk, or Archive folders). I've just arrived home to see if my sleeping MacBook has not been synced in the meantime, but it turns out this is also true in sleep mode.
I did not enable Time Machine and do not back up my Mac because I have everything in iCloud.
Does anyone know if there is any internal garbage / cache or any other place to look for these emails?