Bug#1070120: postfix: can't send mail due to obsolete /var/spool/postfix/etc/resolv.conf on new network

[Michael Tokarev]

BTW, do you have any local resolver running -- dnsmasq, systemd-resolver,
unbound, anything, -- or do you have upstream nameservers (the ones from
dhcp etc) directly in /etc/resolv.conf, so that it changes on dhcp etc?

Thanks,

/mjt