letters described below.
Bounces will be sent to this address.
+If
+.B QMAILMFTFILE
+is set,
+.B qmail-inject
+reads a list of mailing list addresses,
+one per line,
+from that file.
+If To+Cc includes one of those addresses (without regard to case),
+.B qmail-inject
+adds a Mail-Followup-To field
+with all the To+Cc addresses.
+.B qmail-inject
+does not add Mail-Followup-To
+to a message that already has one.
+
The
.B QMAILINJECT
environment variable