+ 2. The "control=submission" facility has a new option /retain_sender. This
+ has the effect of setting local_sender_retain true and local_from_check
+ false for the incoming message in which it is encountered.
+
+ 3. $recipients is now available in the predata ACL (oversight).
+
+ 4. The value of address_data from a sender verification is now available in
+ $sender_address_data in subsequent conditions in the ACL statement. Note:
+ this is just like $address_data. The value does not persist after the end
+ of the current ACL statement. If you want to preserve it, you can use one
+ of the ACL variables.
+