diff --git a/data/conf/dovecot/global_sieve_before b/data/conf/dovecot/global_sieve_before
index 3e79ca1d..ef9f5474 100644
--- a/data/conf/dovecot/global_sieve_before
+++ b/data/conf/dovecot/global_sieve_before
@@ -1,7 +1,13 @@
 # global_sieve_before script
 # global_sieve_before -> user sieve_before (mailcow UI) -> user sieve_after (mailcow UI) -> global_sieve_after
 
-require ["mailbox", "fileinto"];
+require ["mailbox", "fileinto", "date", "editheader", "variables"];
+
+if not exists "Date" {
+  if date :matches "received" "std11" "*" {
+    addheader :last "Date" "${1}";
+  }
+}
 
 if header :contains ["Chat-Version"] [""] {
   if mailboxexists "DeltaChat" {