Louis has a filtering recipe with this action:
| formail -Yf -I "X-Loop: list(_at_)keyslapper(_dot_)org"
*NEVER* use formail -I to add X-Loop:. Always use formail -A to add an
X-Loop: header so that anyone else's X-Loop: remains intact.
Loops aren't always cases of spinning around in one person's system.
Sometimes a loop keeps a message ricocheting between two people (or among
three or more). If everybody keeps removing everyone else's X-Loop: headers,
it will never stop.
That's why I used -A when I first answered the question about loop prevention.
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