diff --git a/deploy.sh b/deploy.sh
index eb58831..344b510 100644
--- a/deploy.sh
+++ b/deploy.sh
@@ -606,14 +606,17 @@ nix_generation() {
   cp -avu templates/nix-config/misc/* final-nix-config/etc/nixos/misc/
 
   echo -e "\n✅ Writing correct ips to configuration.nix..."
-  envsubst '$HOME_SERVER_IP $HOME_ROUTER_IP $TARGET_INTERFACE' <final-nix-config/etc/nixos/misc/networking.nix > final-nix-config/etc/nixos/misc/networking.nix.tmp
-  mv final-nix-config/etc/nixos/misc/networking.nix.tmp final-nix-config/etc/nixos/misc/networking.nix
-  envsubst '${DOMAIN_NAME} ${EMAIL_ADDRESS} ${SENDER_EMAIL_DOMAIN} ${SENDER_EMAIL_ADDRESS}' <final-nix-config/etc/nixos/misc/mail.nix > final-nix-config/etc/nixos/misc/mail.nix.tmp
-  mv final-nix-config/etc/nixos/misc/mail.nix.tmp final-nix-config/etc/nixos/misc/mail.nix
-  envsubst '$PODMAN_NETWORKS' <final-nix-config/etc/nixos/misc/activation.nix > final-nix-config/etc/nixos/misc/activation.nix.tmp
-  mv final-nix-config/etc/nixos/misc/activation.nix.tmp final-nix-config/etc/nixos/misc/activation.nix
-  envsubst '$TRAEFIK_NETWORKS $TRAEFIK_REF_NETWORKS' <final-nix-config/etc/nixos/podman/traefik.nix > final-nix-config/etc/nixos/podman/traefik.nix.tmp
-  mv final-nix-config/etc/nixos/podman/traefik.nix.tmp final-nix-config/etc/nixos/podman/traefik.nix
+  sed -i "s|HOME_SERVER_IP|${HOME_SERVER_IP}|g" final-nix-config/etc/nixos/misc/networking.nix
+  sed -i "s|HOME_ROUTER_IP|${HOME_ROUTER_IP}|g" final-nix-config/etc/nixos/misc/networking.nix
+  sed -i "s|TARGET_INTERFACE|${TARGET_INTERFACE}|g" final-nix-config/etc/nixos/misc/networking.nix
+  sed -i "s|DOMAIN_NAME|${DOMAIN_NAME}|g" final-nix-config/etc/nixos/misc/mail.nix
+  sed -i "s|EMAIL_ADDRESS|${EMAIL_ADDRESS}|g" final-nix-config/etc/nixos/misc/mail.nix
+  sed -i "s|SENDER_MAIL_DOMAIN|${SENDER_EMAIL_DOMAIN}|g" final-nix-config/etc/nixos/misc/mail.nix
+  sed -i "s|SENDER_MAIL_ADDRESS|${SENDER_EMAIL_ADDRESS}|g" final-nix-config/etc/nixos/misc/mail.nix
+  local ESCAPED_PODMAN_NETWORKS="${PODMAN_NETWORKS//|/\\|}"
+  ESCAPED_PODMAN_NETWORKS="${ESCAPED_PODMAN_NETWORKS//$'\n'/\\n}"
+  sed -i "s|PODMAN_NETWORKS|${ESCAPED_PODMAN_NETWORKS}|" final-nix-config/etc/nixos/misc/activation.nix  sed -i "s|TRAEFIK_NETWORKS|${TRAEFIK_NETWORKS//$'\n'/\\n}|" final-nix-config/etc/nixos/podman/traefik.nix
+  sed -i "s|TRAEFIK_REF_NETWORKS|${TRAEFIK_REF_NETWORKS//$'\n'/\\n}|" final-nix-config/etc/nixos/podman/traefik.nix
   if [[ "${TARGET_TPM}" == "true" ]]; then
     sed -i "s|#  boot.initrd.systemd.tpm2.enable = true;|  boot.initrd.systemd.tpm2.enable = true;|" final-nix-config/etc/nixos/configuration.nix
     sed -i "s|#    ./disks/pcr-check.nix|    ./disks/pcr-check.nix|" final-nix-config/etc/nixos/configuration.nix