I have a problem with postfix, is not sending emails : this is from the mail.log : When i check with www.checkdns.net tells me the mx records are working properly but checking : dig domain mx i see i don't have authoritative mx records and emails are not sent What to do ?
The DNS on your mail server is not working. check that you have correct DNS servers in /etc/resolv.conf
As you can see the DNS server is not returning any answer. You need to use servers that will respond, if your servers are not working use the opendns servers.
ok but why are not working ? also related to my IPs Godaddy sais "errors were detected" when i try to add my IPs , nameservers for a domain name in their panel.
Dude you need to understand how DNS works, there is authoritative and recursive. The DNS servers you configure with godaddy are your authoritative name servers. You need recursive name servers for you to be able to resolve other peoples domain names.
It seems you need a glue record: http://en.wikipedia.org/wiki/Domain_Name_System#Circular_dependencies_and_glue_records Anyway, as topdog suggested, I'd put different nameservers in /etc/resolv.conf.