Ignore moves from junkmail to Junk (and from Junk to junkmail)

root/usr/libexec/dovecot/sieve/report-ham.sieve

@@ -2,7 +2,9 @@ require ["vnd.dovecot.pipe", "copy", "imapsieve", "environment", "variables"];
 if environment :matches "imap.mailbox" "*" {
   set "mailbox" "${1}";
 }
-if string "${mailbox}" "Trash" {
+if anyof (string "${mailbox}" "Trash",
+          string "${mailbox}" "junkmail",
+          string "${mailbox}" "Junk") {
   stop;
 }
 pipe :copy "learn-ham.sh";