If you've ever had to deal with corrupt mbox files, in which some 'From lines' were not separated from the preceding message by the required blank line, you might find this program useful. fls (From line separator) will insert blank lines before 'From lines' only where needed. The resulting mbox file is output to STDOUT.

C compiler
“fls” is Copyright © Dario Niedermann
released with NO WARRANTY under the terms of the GPLv3 license.

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