matching the "-a" argument?

Hello,

In my postfix config I deliver to procmail with -a

        mailbox_command = /usr/bin/procmail -a "$EXTENSION"

How can I then match that $EXTENSION variable in my ~/.procmailrc?

I tried:

        :0
        *$ 1 ?? extension
        .junk-extension/

after reading that the -a arguments are numbered from $1, etc. but it
doesn't match.

How should I do it?

Thanks,

-- 
Which is worse, ignorance or apathy? Who knows? Who cares?

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