Hello,

During transaction, it's not (yet) possible to modify headers. So, before having accepted the message for delivery, there is no way to add these headers. One workaround was to modify headers and re-injecting the mail in the queue... Gordon documented this feature but spamassassin filter does not implement it.

To have headers AND filtering, you will have 2 ways: - using maildrop: it means spammers will see their mail accepted. No error messages for the sender when the message is flagged - re-injecting the mail in the queue. Depending on the load on the mailserver, it's possible or not.

HTH. Jerome Blion.