I'm experiencing the same issue. Commenting out this line in /etc/resolvconf/update-libc.d/postfix solved it for me:
/usr/sbin/service postfix status >/dev/null 2>&1 || exit 0 My guess is that the race condition works like this: 1. configure-instance.sh is ran through ExecStartPre before /etc/resolv.conf has been properly set up. This copies an empty /etc/resolv.conf to the Postfix chroot. 2. resolvconf sets up /etc/resolv.conf and runs /etc/resolvconf/update-libc.d/postfix. This script does nothing as the Postfix service has not been started yet. 3. The Postfix service is started through ExecStart, but still has a broken resolv.conf file in its chroot.
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