Sorry for the delay, I was out of office yesterday.

To start, please check the event log, namely the Antivirus category. Does it show any warnings/errors?

avast really shouldn’t alter any messages, never, unless a positive virus infection is found. But that would appear in the logs.

BTW you said: … The attachments also not allowed to see, those are removed, replcaed with a .txt, which also empty

what are the full filenames (with the .txt extensions)? I.e. you’re only talking about the extensions, but what are the names?

Thanks
Vlk