Why is the maximum number of InBox files 5 ?
Five files is regarded as a typical maximum for normal attachments. Also using a large number of files could lead to management problems and hence detract from the security. There is nothing to stop you zipping a number of files into one and processing this. Bear in mind any restrictions by email service providers on file sizes. The file size limit is 1 GB if you want to transport or store the encrypted files on CD or DVD.