diff --git a/setup.sh b/setup.sh
index 945f7a5..31e2885 100644
--- a/setup.sh
+++ b/setup.sh
@@ -238,7 +238,11 @@ echo "echo \"Done.\"" >> /mnt/setup-chroot.sh
 echo "echo \"\"" >> /mnt/setup-chroot.sh
 echo "echo \"Installing linux image, bash, screen, tmux, zfs, vim, sharutils, docker, dosfstools, sendmail, mailutils, openssh, ufw...\"" >> /mnt/setup-chroot.sh
 
+# preconfigure postfix for no configuration
+echo "debconf-set-selections <<< \"postfix postfix/main_mailer_type string 'No configuration'\"" >> /mnt/setup-chroot.sh
+
 #echo "errors=\$(apt install -y --no-install-recommends linux-image-generic 2>&1 1>/dev/null && apt install -y vim bash screen tmux zfs-initramfs dosfstools openssh-server ufw mailutils docker.io sharutils 2>&1 1>/dev/null)" >> /mnt/setup-chroot.sh
+
 echo "apt install -y --no-install-recommends linux-image-generic && apt install -y vim bash screen tmux zfs-initramfs dosfstools openssh-server ufw mailutils docker.io sharutils" >> /mnt/setup-chroot.sh
 
 echo 'if ! [ "$?" = "0" ]; then '>> /mnt/setup-chroot.sh