On-demand database scan

Number of scan threads - Specify how many threads should ESET Mail Security use when scanning the databases. The higher the number, the better the performance. However, this has an effect on how much resources are used. If you configure On-demand database scan to use too many threads, it may put too much of a load on your system, which in turn might slow down other processes or even the whole system. The default value is set to 4 scan threads.

Scan soft-deleted notes - If user soft-deletes a note, it is moved to a Trash folder. Normally, soft-deleted notes are not being scanned. If you enable this option, Trash folders will be scanned as well.