I'm having problems with Sendmail not properly sending e-mails to a group of people using BCC. I've researched the problem a bit and I've found that the problem exists at the receiving Sendmail daemon before the mail is forwarded to the catch-all accounts for pickup by GMail.

It seems like sendmail doesn't properly copy and expand the BCC list to recipients when the e-mail is sent to a catch-all account, especially if the BCC recipients are from the same domain in GMail; it appears the BCC header is stripped before it reaches GMail, so GMail doesn't know who to send the mail to.

This is about all I've found out so far. Is there a solution to this problem?