operation on multiple messages

[Clint Adams]

The manpage says

       The input may be one message or many. Messages are  broken
       up on From_ lines. The algorithm is relatively insensitive
       to message miscounts.


This didn't work particularly well in versions 0.7 and prior.  In
0.7.4, it doesn't seem to work at all.

Example:

zsh/2 591 % formail -s bogofilter -p <mbox | grep X-Sp
X-Spam-Status: No, tests=bogofilter
X-Spam-Status: No, tests=bogofilter
X-Spam-Status: No, tests=bogofilter
X-Spam-Status: No, tests=bogofilter
X-Spam-Status: No, tests=bogofilter
X-Spam-Status: No, tests=bogofilter
X-Spam-Status: No, tests=bogofilter
X-Spam-Status: No, tests=bogofilter
X-Spam-Status: No, tests=bogofilter

zsh/2 592 % bogofilter -p <mbox | grep X-Sp           
X-Spam-Status: No, tests=bogofilter

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