--- amavisd.orig	2018-12-19 19:12:01.575875000 +0100
+++ amavisd	2018-12-19 19:16:01.730197000 +0100
@@ -28858,5 +28858,5 @@
         if ($one_at_a_time) {  # glob templates may be substrings anywhere
           local($1);  @query_expanded = @query_template;  # start afresh
-          s{ ( {} (?: / \* )? | \* ) }
+          s{ ( \{\} (?: / \* )? | \* ) }
            { $1 eq '{}'   ? "$tempdir/parts"
            : $1 eq '{}/*' ? ($multi=1,"$tempdir/parts/$f")