no IP address found for host

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http://forums.cpanel.net – I'm sending a PHP-mail-form located on "server 1" to a receiver on "server 2" Server 1: cPanel webserver Server 2: Dovecot mailserver The email is received and everything on "server 2", but when I check the maillog on "server 2" I get this: --- no IP address found for host *hostname*.fastbit.se (during SMTP connection from *ipnumber*) --- fastbit.se is the internet provider at the hosting company as far as I know, and the end point when I'm running a traceroute to the IP of "server 2". The question is: Is this something I set in cPanel, lik (HowTos)