Sorry to bother the whole list with this, but it's the only way I can get a message through to "B. T. Raven" <nihil@nihilo.net>.

"B. T. Raven" <nihil@nihilo.net> responded on this list to my question about Emacs replace functions sometimes not working.  But when I tried to respond to his email, my response bounced with:
This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  nihil@nihilo.net
    SMTP error from remote mail server after RCPT TO:<nihil@nihilo.net>:
    host mailserver.nihilo.net [213.171.216.114]:
    550 <nihil@nihilo.net>: Recipient address rejected:
    User unknown in virtual mailbox table
In case nihil@nihilo.net is reading this list, do you have any idea why your mailserver is rejecting emails addressed to you?  Is there an alternate email address I can mail you at?
Mark Rosenthal
mbr@arlsoft.com