Auto-Replies to All Email Recipients

By default, Znuny only sends automatic replies to the sender of an email. This add-on closes that gap by extending the auto-response system to cover all recipients of the incoming email. The add-on introduces a set of new auto-response types — "to all" variants of every standard type: auto reply to all, auto reject to all, auto follow up to all, auto reply/new ticket to all, and auto remove to all. These are configured the same way as standard auto-responses and assigned to queues through the existing auto-response administration. The "to all" behavior only activates when there are at least two addresses across the To and Cc headers, so single-sender emails continue to behave exactly as before. All of Znuny's standard safeguards apply: loop protection, system address filtering, and the SendNoAutoResponseRegExp pattern are all respected for each recipient individually.