.B nmh
can read message files in that antiquated format.
.PP
-Each user possesses a mail drop box which initially receives all messages
-processed by
-.BR post .
+Each user possesses a system maildrop box which initially receives all
+messages delivered by the MTA.
.B Inc
-will read from that drop
-box and incorporate the new messages found there into the user's own
+will read from that maildrop
+and incorporate the new messages found there into the user's own
mail folders (typically
.RI \*(lq +inbox \*(rq).
-The mail drop box consists of one or more messages.
.PP
Messages are expected to consist of lines of text. Graphics and binary
-data are not handled. No data compression is accepted. All text is
+data are not directly handled. No data compression is accepted. All text is
clear ASCII 7-bit data.
.PP
The general \*(lqmemo\*(rq framework of RFC\-822 is used. A message
by the user are address fields such as \*(lqTo:\*(rq, \*(lqCc:\*(rq,
etc. Internet addresses are assigned mailbox names and host computer
specifications. The rough format is \*(lqlocal@domain\*(rq, such as
-\*(lqMH@UCI\*(rq, or \*(lqMH@UCI\-ICSA.ARPA\*(rq. Multiple addresses
+\*(lqbob@example.org\*(rq. Multiple addresses
are separated by commas. A missing host/domain is assumed to be the
local host/domain.
.PP
.PP
Following is a list of header components that are considered
meaningful to various
-.B nmh
+.B mmh
programs.
.PP
.BR Date :
.RS 5
Added by
-.BR post ,
-contains date and time of the message's entry
+.BR spost .
+Contains date and time of the message's entry
into the mail transport system.
.RE
.PP
.BR From :
.RS 5
Added by
-.BR post ,
-contains the address of the author or authors
+.BR spost .
+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 Sender :
.RS 5
Added by
-.B post
+.B spost
in the event that the message already has a
\*(lqFrom:\*(rq line. This line contains the address of the actual
sender.
Contains addresses of primary recipients.
.RE
.PP
-.BR cc :
+.BR Cc :
.RS 5
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
+.B mmh
uses an encapsulation method for blind copies, see
-.BR send .
+.BR send (1)
+or
+.BR spost (8).
.RE
.PP
.BR Fcc :
.RS 5
Causes
-.B post
+.B spost
to copy the message into the specified folder for the sender,
if the message was successfully given to the transport system.
.RE
.PP
.BR Message\-ID :
.RS 5
-A unique message identifier added by
-.B post
-if the
-.B \-msgid
-flag is set.
+A unique message identifier added by the MTA.
.RE
.PP
.BR Subject :
.BR Resent\-Date :
.RS 5
Added when redistributing a message by
-.BR post .
+.BR spost .
.RE
.PP
.BR Resent\-From :
.RS 5
Added when redistributing a message by
-.BR post .
+.BR spost .
.RE
.PP
.BR Resent\-To:
.PP
.BR Resent\-Message\-Id :
.RS 5
-A unique identifier glued on by
-.B post
-if the
-.B \-msgid
-flag is set.
+A unique identifier glued on by the MTA.
See \*(lqMessage\-Id:\*(rq and \*(lqResent\-To:\*(rq.
.RE
.PP
-.BR Resent :
+The following non-standard header components are also meaningful to
+.B mmh
+tools:
+.PP
+.BR Attach :
.RS 5
Annotation for
-.B dist
+.B send
+to attach the given file to the message being sent.
+.RE
+.PP
+.BR Replied :
+.RS 5
+Annotation for
+.B repl
under the
.B \-annotate
option.
option.
.RE
.PP
-.BR Replied :
+.BR Resent :
.RS 5
Annotation for
-.B repl
+.B dist
under the
.B \-annotate
option.