diff --git a/dovecot/sieve/after.sieve b/dovecot/sieve/after.sieve
index 3026395b..4fb398ce 100644
--- a/dovecot/sieve/after.sieve
+++ b/dovecot/sieve/after.sieve
@@ -1,5 +1,6 @@
-require ["fileinto", "envelope", "mailbox"];
+require ["fileinto", "envelope", "mailbox", "imap4flags"];
 
 if header :contains "X-Spam" "YES" {
   fileinto :create "Junk";
+  setflag "\\seen";
 }