Hi all, I can send mail internally (clients, they are able to send mails to each other through the new mail server Redhat 8.0 using sendmail-8.12.5-7) but I can not send out-side the local server (clients can not send mails to another mail server), I copied what I got: The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was 'user1@hotmail.com'. Subject 'test external 1', Account: 'IMAP', Server: 'mail.domain.com', Protocol: SMTP, Server Response: '550 5.7.1 ... Relaying denied. IP name lookup failed [192.168.32.101]', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79 My access file look like (/etc/mail/access), 192.168.32. RELAY Please Help Regards, Yasser Nagy

Your mail server is broadcasting it's name as 'mail.domain.com' and the target mail server is saying it will only accept mail from machines with real names. mail.domain.com does not resolve to a valid IP address