diff --git a/mail-server.nix b/mail-server.nix
index d66cd82..c4f467f 100644
--- a/mail-server.nix
+++ b/mail-server.nix
@@ -344,7 +344,7 @@ in {
           };
           imap = {
             service = {
-              networks = [ "internal_network" ];
+              networks = [ "internal_network" "external_network" ];
               ports = [ "143:143" "993:993" ];
               volumes = [
                 "${cfg.state-directory}/dovecot:/state"