contains the address of the author or authors
(may be more than one if a \*(lqSender:\*(rq field is present). For a
standard reply (using
-.BR repl ,
+.BR repl ),
the reply address is constructed by
checking the following headers (in this order): \*(lqMail-Reply\-To:\*(rq,
\*(lqReply\-To:\*(rq, \*(lqFrom:\*(rq, \*(lqSender:\*(rq.
-A
-.BR From :
+A \*(lqFrom:\*(rq
header MUST exist when the message is sent to
.BR post,
otherwise the message will be rejected.
.PP
.BR Sender :
.RS 5
-Added by
+Required by
.B post
-in the event that the message already has a
-\*(lqFrom:\*(rq line. This line contains the address of the actual
+in the event that the message has multiple addresses on the
+\*(lqFrom:\*(rq line. It is otherwise optional. This line should
+contain the address of the actual
sender.
.RE
.PP
Contains addresses of secondary recipients.
.RE
.PP
-Bcc:
+.BR Bcc :
.RS 5
Still more recipients. However, the \*(lqBcc:\*(rq line is not
copied onto the message as delivered, so these recipients are not
listed.
.B nmh
uses an encapsulation method for blind copies, see
-.BR send .
+.BR send (1).
+.RE
+.PP
+.BR Dcc :
+.RS 5
+Still more recipients. However, the \*(lqDcc:\*(rq line is not
+copied onto the messages as delivered. Recipients on the \*(lqDcc:\*(rq
+line receive the same messsage as recipients on the \*(lqTo:\*(rq and
+\*(lqcc:\*(rq lines. See
+.BR send (1)
+for more details.
.RE
.PP
.BR Fcc :