Email Address not found: Postfix looking for ip6V address on sendmail

[rmk]

NethServer Version: 7.4.1708 (beta1)
Module: email / postfix

After upgrading to Nethserver 7.4.1708, I get an error when sending email to another Nethserver …

Example: Error Message of return mail –

emailuser@domain Host or domain name not found. Name service error for
name=xxx.1xx.xx.xxx.domain type=AAAA: Host not found

why is it looking for a IP6V Address for the other Mail Server… ?

when doing nslookup … it shows that the domain is set with an IP4V on the receiving email server…not IP6V

My Email Server is using ip4V, no ip6V , yet the nethserver postfix seems want to send email using ip6V…
Is there a setting that I missed that I can default my Nethserver POSTFIX to send EMAILS via IP4V address ?

[mrmarkuz]

Hi @rmk,

you may test changing “inet_protocols = ipv4” in main.cf, restart postfix and see if it solves your problem…

[rmk]

Thnx for the quick response…I did that =on the my Sending Email Server…
I realize now it’s receiving Email Server having some kind of DNS resolution issue…
Now I get another error:

user@domain… Host or domain name not found. Name service error for
name=xxx.xx2.xx0.122.Domain.net type=A: Host not found

But I can do nslookup on the receiving email server… tested OK… found the IP and resolved…
Puzzled…

[mrmarkuz]

You may try nslookup on your servers and check if they can reach each other by ping with the IPs you got by nslookup. Maybe it’s a private/public ip problem(split dns).

Maybe you did manual changes in /etc/resolv.conf that were overwritten after a reboot?

Some sources to your error I found:

Postfix error: Host or domain name not found

http://kb.odin.com/de/126874

[rmk]

Thanks you all… you are correct … the data file in Name Server somehow got corrupted,causing such error
… it is fixed now…

[mrmarkuz]

Thanks you all

You’re welcome.

… it is fixed now…

If the problem is fixed for you please mark the topic as solved.