diff --git a/lass/2configs/mail.nix b/lass/2configs/mail.nix
index feb532709..e39c09b84 100644
--- a/lass/2configs/mail.nix
+++ b/lass/2configs/mail.nix
@@ -48,6 +48,8 @@ let
     set use_from=yes
     set envelope_from=yes
 
+    set sort=threads
+
     set index_format="%4C %Z %?GI?%GI& ? %[%d/%b]  %-16.15F %?M?(%3M)&     ? %s %> %?g?%g?"
 
     virtual-mailboxes \