diff --git a/bundles/dovecot/files/dovecot.conf b/bundles/dovecot/files/dovecot.conf
index 56a3ae4..a23e37c 100644
--- a/bundles/dovecot/files/dovecot.conf
+++ b/bundles/dovecot/files/dovecot.conf
@@ -11,6 +11,7 @@ namespace inbox {
     mailbox Junk {
         auto = subscribe
         special_use = \Junk
+        autoexpunge = 30d
     }
     mailbox Sent {
         auto = subscribe