more shared folder problems

[Prentice Bisbal]

I'm still having problem with shared folders. I'm using Simon's RPMs 
(latest version, just installed ysterday).

Instead of "deposit" (as I posted yesterday), I created the shared 
folder "shared.deposit" on my system. I removed the default acl for 
anyone and did

sam shared.deposit anonymous p
sam shared.deposit prentice all

When I send mail to bb+deposit, sendmail says the user is unknown:

Dec 18 12:58:30 pdb-linux-7 sendmail[16817]: hBIHrIP16814: 
to=bb+deposit, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, 
mailer=cyrus, pri=30035, relay=localhost, dsn=5.1.1, stat=User unknown
Dec 18 12:58:30 pdb-linux-7 sendmail[16817]: hBIHrIP16814: hBIHrIO16817: 
DSN: User unknown

Is the problem in my sendmail configuration? I'm using RH Linux 7.3. To 
create my sendmail.cf file, I did

cp /usr/share/doc/cyrus-imapd-2.1.16/cyrusv2.mc /etc/mail

cd /etc/mail

m4 /usr/share/sendmail-cf/m4/cf.m4 cyrusv2.mc > /etc/sendmail.cf

In cyrusv2.mc, I commented out FEATURE(`preserve_local_plus_detail')dnl
since I'm not using sendmail 8.12. I could post both my .mc files or the 
resulting senmail.cf  if it would help.

Thanks

Prentice