DavidR
2
Without more information on what was said about the mail files, I can’t really suggest an option. What was the exact message?
I wouldn’t get rid of anything until you are sure they are a problem/infected. RAV may not be able to scan these files, which is why it is reporting it. In the same way avast can’t scan encrypted and password protected files, avast tells you it couldn’t scan them, not that there is a problem with them.
I assume that you have scanned your system with avast and it was clean? You could try another on-line scan such as Trend’s Housecall.