For resolv.conf problem use chattr could help there!
“If you have other programs that might modify it (like a DHCP client), you’ll have to see about reconfiguring them. Or chattr +i /etc/resolv.conf after making it a static file instead of a symlink, but beware that whatever tries to write it, might not like the resulting errors.”
More info here
Take care for reversedns ptr records for ipv6 while otherwise gmail problem .
Take care you have at the virtualservers itself also the ipv6, and there for the hostname part to if using
I don’t have any ipv6 in resolv.conf, but ipv6 working on mail and so.
But the nameserver of hoster is in resolv.conf so it could find domain/ip on the box , and because of their network settings and ip’s
But if that nameserver doesn’t do ipv6 (translations somewhere) you can use a ipv6 nameserver there to as i have on a other box
I am using external dns services!
Yes and no the chattr for the resolv.conf you can use however is on every OS.
Is the only part i can help , but i don’t understand your problem further.
"If you really aren’t using DHCP, my suspicion is that your provider is overwriting your resolv.conf file with a fresh one anytime you reboot. You may want to discuss that with them.
nameserver 127.0.0.1
to /etc/resolv.conf - than run this command
chattr +i /etc/resolv.conf
to make the file resolv.conf immutable (will no longer be able to be overwritten on boot)"