I've just got a bounce from an message I sent to the mailing list a while ago, it says:-
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:
dokuwiki@freelists.org
SMTP error from remote mail server after RCPT TO:<
dokuwiki@freelists.org>:
host turing.freelists.org [206.53.239.180]: 450 4.7.1 Client host rejected:
cannot find your hostname, [195.159.176.226]:
retry timeout exceeded