its removal from incoming messages, so that delivered messages can safely be
resent to other recipients.
+.new
+&*Note:*& If used on a transport handling multiple recipients
+(the smtp transport unless &%rcpt_max%& is 1, the appendfile, pipe or lmtp
+transport if &%batch_max%& is greater than 1)
+then information about Bcc recipients will be leaked.
+Doing so is generally not advised.
+.wen
+
.option event_action transports string&!! unset
.cindex events