Hi,
Also is there some way to tell Avast to not scan thunderbird?!?
Turn off mail shield i guess?
Yes, it's a solution, but the best solution would be for avast to look into the matter because it's not normal for users not to be able to recover quarantined emails, especially when they are false positives.
The problem is that in some email clients, emails aren't stored as individual files within a folder, but as part of a compressed archive format.
For instance the whole folder 'InBox' is just an archive file and not a folder as in the windows explorer sense. So emails have to be inserted into that compressed archive file/folder. Now the email client can do that gracefully without issue (as it knows what format, etc.), but another program trying to do that from the outside could well corrupt that archive with the loss of all emails in that archive, not just that email. It is also my practice not to store lots of emails in InBox for this and other reasons (system crash, etc.).
The other issue is, because the Mail Shield is acting as a man in the middle, it intercepts the email to scan it before it gets into the email folder/file archive, It can't easily just place it into the InBox folder if it is a compressed archive.
I have my settings, not to take any autonomous action but to Ask (in all shields) and I make the decision what to do. I also vet my emails (Mail Washer) before allowing them passage to the email client (Thunderbird).