bcc's not accepted?

[Scott Sharkey]

Hi everyone,

I've got a customer running qmail with vpopmail, and he's reporting 
that qmail is not delivering messages to bcc'ed recipients.  He was
testing with hotmail.com, and by telnetting directly to qmail.  Is 
anyone aware of any circumstances in which the bcc'ed recipients would
be dropped or refused?

Thanks!

-Scott