Hi, One of the subscribers is quite often generating the following message which i get multiple times. it doesn't happen every time I send to the list, only on occasions. Thanks. Andrew. -----Original Message----- From: postmaster@xxxxxxxxxxx [mailto:postmaster@xxxxxxxxxxx] Sent: Tue 13/09/2005 09:34 To: Andrew Hodgson Subject: Message delayed (access-uk@xxxxxxxxxxxxx) Your message has been delayed and is still awaiting delivery to the following recipient(s): access-uk@xxxxxxxxxxxxx Message delayed 450 Client host rejected: cannot find your hostname, [81.17.72.78] No recipients were successfully delivered to.