List Flag: unix-archives

Generates archives in a UNIX mailbox format, i.e. terminated by a blank
line and started with a "From " line.  This will also cause the
"In-Reply-To:" header to be copied from the incoming message if such
is present.

The default is to separate archive entries by a dividing line of hyphen
("-") characters, and omit the UNIX "From " line and "In-Reply-To:"
header.

See also: Archiving archived archivelist archroll sendarchive