Hi, Sorry if this is way off topic, but I've spent the past few hours web searching and trying different things for the following sendmail error: 554 5.7.1 To: and CC: are not filled which results when an email comes into the system where the sender has only populated the "Bcc" field and not the "To" or "CC" fields. I don't want these messages rejected yet can't seem to find anyway within sendmail to stop the rejection and allow the messages through. Any ideas what I should try to get this working? Thanks. Michael.