problem sending mail to shared mailbox

[Erik Myllymaki]

> under cyrusv2 mailer with sendmail (making an assumption)
>
> > cm shared.alerts
> > sam shared.alerts anonymous p (required for delivery)
>
> alerts      :       +shared.alerts at mailhost
>
> Erik Myllymaki wrote:
> >
> > I created a shared mailbox but I cannot send mail to it.
> >
> > I get bblist1 at example.com 550 Unknown User?
> >
> > cyradm>cm bblist1
> > cyradm>sam bblist1 anyone lrswipcda
> > cyradm>lam bblist1
> > anyone lrswipcda

sorry, this message was sent before I had a chance to finish it.

I am using Exim as my SMTP server and looking at the logs more carefully, it
is Exim that errors with "550 - Unknown User".

I create the mailbox like this:

> > cyradm>cm bblist1
> > cyradm>sam bblist1 anyone lrswipcda
> > cyradm>lam bblist1
anyone lrswipcda