diff --git a/services/mail/service.nix b/services/mail/service.nix
index c1b3d84..442449e 100644
--- a/services/mail/service.nix
+++ b/services/mail/service.nix
@@ -25,6 +25,8 @@ in
 
     localDnsResolver = false;
 
+    quota.defaults.perUser = "10G";
+
     accounts = {
       "admin@${domain}" = {
         hashedPasswordFile = sec."mail/serviceHashedPassword".path;