diff --git a/hosts/alpha/network.nix b/hosts/alpha/network.nix
index 25bb013..a2b66dc 100644
--- a/hosts/alpha/network.nix
+++ b/hosts/alpha/network.nix
@@ -91,6 +91,7 @@
   };
 
   networking = {
+    firewall.allowedTCPPorts = [25];
     firewall.allowedUDPPorts = [51820 51821];
   };