diff --git a/config/services/dovecot.nix b/config/services/dovecot.nix
index 6c9e2236..b0ab1b73 100644
--- a/config/services/dovecot.nix
+++ b/config/services/dovecot.nix
@@ -126,6 +126,8 @@ in
           group = postfix
         }
       }
+      first_valid_uid = 76
+      last_valid_uid = 76
     '';
     user = "dovecot";
     group = "dovecot";