OK, running RH 7.1 with sendmail 8.11.6. I've done all the applicable updates using up2date. Just today, I notice that I am no longer able to send mail via POP or IMAP when the BCC field is used. From the Windows workstation, it appears to start sending, then stalls. No errors are reported, it just sits there forever. This happens with Outlook Express 6 and Outlook 2000.

Not sure exactly when this problem originated, but it's been in the last week or so. A search for this problem on the Internet reveals no clues, nor can I find anything applicable on the sendmail docs. It was working, then stopped. I want to sound like a typical end user, and say that "nothing's changed", but I think something must have.

Can anyone point me in the right direction?