A question about using procmail to filter duplicate emails inpostfix smt

in postfix main.cf, I have the following line
mailbox_command = /usr/local/bin/procmail -o -a $DOMAIN -d $LOGNAME

I have a alias
        "alias1" = bates

I have a default procmailrc in /usr/local/etc/procmailrc
#### FInd the duplicate message and wipe it out
:0 Whc: msgid.lock
| formail -D 8192 msgid.cache

:0 a:
duplicates
## Will be changed to /dev/null when correct



I send a email to bates,alias1,user2

the first user bates gets only one email. (This is great)
the "user2" doesn't get any mail.
What do I need to do to correct this problem?

Richard Bates


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