diff --git a/config/dovecot/default.sieve b/config/dovecot/default.sieve
new file mode 100644
index 0000000..09a1373
--- /dev/null
+++ b/config/dovecot/default.sieve
@@ -0,0 +1,4 @@
+require "fileinto";
+if header :contains "X-Spam-Flag" "YES" {
+    fileinto "Spam";
+}
\ No newline at end of file