diff --git a/email.nix b/email.nix
index f01a19e..80ae588 100644
--- a/email.nix
+++ b/email.nix
@@ -16,7 +16,7 @@
   mailserver = {
     enable = true;
     fqdn = "mail.eurofusion.eu";
-    domains = [ "eurofusion.eu"];
+    domains = [ "eurofusion.eu" ];
 
     loginAccounts = config.secrets.emailAccounts;
 
@@ -35,13 +35,16 @@
     enableSubmissionSsl = true;
   };
 
-  # Improve hashing speed
   services.dovecot2.extraConfig = ''
+    # Improve hashing speed
     auth_cache_verify_password_with_worker = yes
   '';
-  # Prefer IPv6
+
   services.postfix.extraConfig = ''
+    # Prefer IPv6
     smtp_address_preference = ipv6
+    # Prevent binding on temporary addresses
+    smtp_bind_address6 = 2001:470:c8e8:0:230:48ff:fefa:91e1
   '';
 
 }