diff --git a/data/conf/dovecot/global_sieve_before b/data/conf/dovecot/global_sieve_before
index 3e79ca1d3..e71be5100 100644
--- a/data/conf/dovecot/global_sieve_before
+++ b/data/conf/dovecot/global_sieve_before
@@ -1,13 +1,3 @@
 # global_sieve_before script
 # global_sieve_before -> user sieve_before (mailcow UI) -> user sieve_after (mailcow UI) -> global_sieve_after
 
-require ["mailbox", "fileinto"];
-
-if header :contains ["Chat-Version"] [""] {
-  if mailboxexists "DeltaChat" {
-    fileinto "DeltaChat";
-  } else {
-    fileinto :create "DeltaChat";
-  }
-  stop;
-}