. vs. ! ^^^^^

Kreme noted that I used,

> * LISTNAME ?? .
>
> instead of
>
> * ! LISTNAME ?? ^^^^
and commented,

> I'm not sure that matters though.
It's shorter to type, it's shorter for procmail to parse, and if somehow 
LISTNAME ever got defined as a non-empty string consisting only of 
newlines, it would reject that erroneous value.


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