My virusscanner Trend Micro just removed Mairlist.exe!
Reason: Unauthorized file encryption.
I had to copy the exe file of a friend to be able to restart, and the rest stayed intact.
But heads up that virusscanners can remove your mailrlist of your on-air computer!
Yes, had it as well while replacing a file. TrendMicro flagged it is possible virus because mairlist made changes to a file (delete-action). Could restore the file within TrendMicro if I remember well.
Solved it by adding mairlist.exe to the exception list in TrendMicro.