Avast destroyed over 4k Mails

[REDACTED]

@DavidR: then why bother making it look like you can select it? Honestly that doesnt make sense. It showed it as a button/list and even changed style (color) when hovering and clicking, but with no functionally behind it. Why would you make it look like you can choose an option when it is already processed? Its this kind of stuff that makes me think Avast! is becoming unreliable. This plus the fact that it destroys files it "moves".

[DavidR]

I guess to give it a better layout than producing a listing looking like the original text file. 

If you open the avastUI > Protection and click the Scan history, you can select a specific scan that you have run.

Or you can look at the actual report text file, that contains information on all scans and is listed in chronological order, so you would have to scroll down to the bottom of the page for recent scans.
C:\ProgramData\AVAST Software\Avast\report.

But as I have said I'm just an avast user.
Time spent in reconnaissance is seldom wasted, a little time rummaging round the avastUI is time well spent. 

[stibi]

Backups dont help much if they get destroyed by the AV as well.

At least one backup should always be stored on an disk tha is not permanently connected to your PC.

I only once had avast delete an attachment from a spam mail. Currently I think you should NOT let Avast move valuable files to the quarantine, or the might be destroyed.

If you leave many mails in you Inbox, you can be sure that all of them will go to quarantine with a new, infected object.

[Pondus]

It seems he is using GMX mail, and they say unlimited storage  >>  https://www.gmx.com/mail/mail-storage/#.1559512-stage-expendlist1-1

So if he does as i suggested in my first post, then backup should not be a problem   

[REDACTED]

I appreciate the help of you all, but sadly that doesnt help get the missing mails back.  I have contacted Avast via report false-positive section and MartinZ here in forums, as he seems to work for the company. So far I got no answer.

I like my backups local and not in the cloud or on a server somewhere. And that works pretty well. In this case I had to move the primary backup temporarily for privacy reasons, not realizing Avast! would simply destroy every instance of the Inbox it came across. I use Thunderbird for over 10 years now and before that I used MS Outlook. Until now I never lost any mail.

@stibi: Yes I have two older instances of backups. But Im still missing a third of the mails. Its not just the amount, things like this simply should not happen.

@DavidR: my report folder only has aswBoot, BehaviourShield, EmailShield, FileSystemShield, WebShield. In the Scan-History its still there, dunno where its saved. I took a look at the index of the chest and it really only shows the 3 older false positives from some games.

Digging in the files a bit, log of chest shows

14.04.2018   11:59:58   Error 112 in s_NewFile
14.04.2018   11:59:58   Error 112 in chestAddFileRpc
14.04.2018   11:59:59   Error 112 in s_NewFile
14.04.2018   11:59:59   Error 112 in chestAddFileRpc
14.04.2018   11:59:59   Error 112 in s_NewFile
14.04.2018   11:59:59   Error 112 in chestAddFileRpc

Well, destroyed everything in 2 seconds. And from what I can see that happened after I stopped the scan, so if the list/button would have worked it might have been avoidable 

[DavidR]

If you have no report files for the various scans you have run, you need to activate the Generation of a report file, see attached (as in the attached image).

The * asterisk indicates that the report file will take the name of the scan, as in the image in my Reply #16

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Sorry for the late answer, I tried to contact Avast over this issue, so far I didnt even get an auto-response.

Regarding the Report-Files: I looked through different settings and turns out: everywhere except on full scan and target scan it makes logs. Makes no sense but currently Im not suprized by anything from this software. 

[MartinZ]

Hi it's strange that you don't see it in the scan results. Might be a case that the file was too big for chest. Need to check it out

[REDACTED]

Its the same issue that happend here https://forum.avast.com/index.php?topic=218074.0
@MartinZ: currently see 2 Bugs in Avast!
#1 - the functionality of the element to change the actions (that Avast! performs on detected files) in the scan-result area is broken and the user is unable to change the action
#2 - Avast! failes to move files into the Chest and destroys them in the process (should not happen under any circumstances)

Please fix this!

EDIT: adjusted username on request of bob3160

[Asyn]

Dev-Info: The underlying detection (common for all 3 cases) has been updated yesterday so that it shouldn't happen on Thunderbird mailboxes anymore, and I'll try to prevent their removal in a generic way in the next few days.