ok this is my configurations
debian:/home/najd# cat /etc/hostname
debian:/home/najd# cat /etc/hosts
127.0.0.1 localhost debian
192.168.1.169 telnetteam.telnetgroupe.com telnetteam
# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
debian:/home/najd# cat /etc/resolv.conf
# generated by NetworkManager, do not edit!
during the installation i have
DNS ERROR resolving MX for localhost
It is suggested that the domain name have an MX record configured in DNS
Change domain name? [Yes]
what should i do?