I don't want to have double mails in my folder

I've read an article in the Linux Magazine 01/2002. They describe a
way with formail:

####
:0 Wh: $PROCMAILDIR/msgid.lock
|formail -D 32768 $PROCMAILDIR/msgid.cache
/dev/null
####

but this didn't work for me for some reason. Can someone please let me
know if this recipt is ok? If not, where's the problem or is there an
other way to solve this?

Thanks,
    Manuel

-- 
Computers make very fast, very accurate mistakes. 
(contributed by Frank v Waveren) 
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