`REBUILD.SYSTEM` is a utility for converting a folder of email messages (text files named `EMAIL.nnn` where `nnn` is an integer) into a mailbox. It will erase any existing `EMAIL.DB` and `NEXT.EMAIL` files, parse the message files and create new `EMAIL.DB` and `NEXT.EMAIL` files. This tool may be used for bulk import of messages or for recreating the `EMAIL.DB` file for a mailbox which has become corrupted.
If you use this tool for bulk import, be sure that all the `EMAIL.nnn` files are in Apple II text format with carriage return (CR) line endings (not MS-DOS (CRLF) or UNIX style (LF).)