mail undelivery system

[Compadre]

Hi, i have my server running in fedora core 6 and ispconfig. I have a problem about some mail undelivered system returned to the sender. Does mail are mail size of some account to admispconfig@localhost.localdomain.com, but always i receive the msg of undelivered mail:<admispconfig@localhost.localdomain.com>: Host or domain name not
found. Name
service error for name=localhost.localdomain.com type=A: Host found
but no
data record of requested type
Help me plis.

[till]

Please add localhost.localdomain.com to the line that begins with 127.0.0.1 in the file /etc/hosts and at the end of the file /etc/postfix/local-host-names and restart postfix.

[Compadre]

Thanks till,but i had localhost.localdomain in both files for all these time. This cant be the problem, another solution?

[till]

I'am not talking about "localhost.localdomain", I'am talking about "localhost.localdomain.com". Or did you made a mistake as you posted the error message to the forum?