Hi everyone, uname -a : Linux homer 2.2.16-SMP #1 SMP Wed Aug 2 20:01:21 GMT 2000 i686 unknown SuSE Linux 7 Professional I would like sendmail(version 8.10.2) to relay mail messages from a limited number of domains that I specify in advance. I have added the domains that I wish to be relayed to the /etc/mail/access file, ie : a.domain RELAY b.domain RELAY I then did: makemap hash /etc/mail/access < /etc/mail/access then did: /etc/rc.d/sendmail restart However, if a host from the listed domain attempts to relay a message to a third party email address it recieves the following error: "An error occurred while sending mail. The mail server responded: 5.7.1 <garry.smith@computer.org>// Relaying denied. IP name lookup failed [x.x.x.x] Please check the message recipients and try again" The /var/log/mail entry is : Jan 19 16:47:45 homer sendmail[4139]: starting daemon (8.10.2): SMTP+queueing@00:30:00 Jan 19 16:47:45 homer sendmail[4139]: daemon could not open control socket /var/run/sendmail.control: Group writable directory Jan 19 16:48:05 homer sendmail[4146]: f0JGm4L04146: ruleset=check_rcpt, arg1=<garry.smith@computer.org>, relay=[x.x.x.x], reject=550 5.7.1 <garry.smith@computer.org>... Relaying denied. IP name lookup failed [x.x.x.x] Jan 19 16:48:05 homer sendmail[4146]: f0JGm4L04146: from=<Garry.Smith@computer.org>, size=0, class=0, nrcpts=0, proto=ESMTP, daemon=MTA, relay=[x.x.x.x] Where x.x.x.x is the IP address of the host trying to relay the mail through sendmail. If I add the domain to which the email is addressed (in this case 'computer.org') to /etc/mail/relay-domains then the mail is relayed successfully. However, it is not practical to add recipient domains to /etc/mail/relay-domains because mail needs to be sent all over the Internet. Any ideas gratefully recieved. Many thanks in advance Garry