Sorry, that's not a LISTSERV "feature".  That's a well-known sendmail
"feature".

On Tue, 22 Sep 1998 23:35:04 -0400 George Buckner said:
>OK, LSoft, I've already tested this problem enough to know how to
>duplicate it:
>
>I've noticed recently that Listserv has a habit of inserting the
>">" character whenever a paragraph in the message begins with the
>word "From" (with an uppercase "F").  Thus a sentence that started
>with "F" now starts with ">F".
>
>By the way I'm running 1.8d.
>
>Why does Listserv have this "feature" ?
>
>George Buckner
>Owner, Psyche-*, ASSC-*  @LISTSERV.UH.EDU