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mh-mail(5mh)							  mh-mail(5mh)

       mh-mail - message format for MH message system

       MH  processes  messages	in a particular format.	 Although neither Bell
       nor Berkeley mailers produce  message  files  in	 the  format  that  MH
       prefers, MH can read message files in that format.

       Each user has a maildrop that initially receives all messages processed

       The command reads from the maildrop and incorporates the	 new  messages
       found  there  into the user's own folder.  The maildrop consists of one
       or more messages.

       Messages are expected to consist of lines of text.  Graphics and binary
       data are not handled.  No data compression is accepted.	All text is in
       ASCII 7-bit data.

       The general memo framework of RFC 822 is used.  A message consists of a
       block  of  information in a rigid format, followed by general text with
       no specified format.  The rigidly-formatted first part of a message  is
       called  the message header; the free-format portion is called the body.
       The header must always exist, but the body is  optional.	  These	 parts
       are  separated  by  a blank line or by a line of dashes.	 The following
       example shows the standard default MH mail header:

       The header is composed of one or more header items.  Each  header  item
       can  be	viewed	as  a single logical line of ASCII characters.	If the
       text of a header item extends across several real lines, the  continua‐
       tion lines are indicated by leading spaces or tabs.

       Each  header item is called a component and is composed of a keyword or
       name, along with associated text.  The keyword begins at the left  mar‐
       gin,  and  is  terminated  by a colon (:).  It cannot contain spaces or
       tabs, and cannot exceed 63 characters, as specified by RFC 822.

       The text for most formatted components, such as Date: and  Message-Id:,
       is  produced automatically.  The user enters address fields such as To:
       and cc:, and the Subject: field.	 Internet addresses are assigned mail‐
       box  names  and	host  computer	specifications.	 The general format is
       local@domain, for example, MH@UCI or  MH@UCI-ICSA.ARPA.	 A  comma  (,)
       separates  multiple  addresses.	A missing host/domain is assumed to be
       the local host/domain.

       A blank line (or a line of dashes) signals that all following  text  up
       to  the	end  of the file is the body of the message.  No formatting is
       expected or enforced within the body.

       The following is a list of header components that are considered	 mean‐
       ingful to MH programs:

       Date:	 Added	by  contains  the date and time of the message's entry
		 into the transport system.

       From:	 Added by contains the address of the author or authors (there
		 may be more than one if a Sender: field is present).  Replies
		 are typically directed to addresses in the Reply-To: or From:
		 field.	 The former has precedence, if present.

       Sender:	 Added	by  in	the event that the message already has a From:
		 line.	This line contains the address of the  actual  sender.
		 Replies are never sent to addresses in the Sender: field.

       To:	 Contains addresses of primary recipients.

       cc:	 Contains addresses of secondary recipients.

       Bcc:	 Contains the addresses of recipients who receive blind carbon
		 copies of the message.	 The Bcc: line does not appear on  the
		 message as sent, so these recipients are not listed.  Recipi‐
		 ents in the Bcc: field receive a copy of the message  with  a
		 minimal  header.   MH	uses an encapsulation method for blind
		 copies; see

       Fcc:	 Causes to copy the message into the specified folder for  the
		 sender,  if  the message was successfully given to the trans‐
		 port system.

		 A unique message identifier added by if the  -msgid  flag  is

       Subject:	 Sender's commentary.  It is displayed by

		 A commentary line added by when replying to a message.

		 Added by when a message is re-distributed.

		 Added by when a message is re-distributed.

		 New recipients for a message re-sent by

		 New secondary recipients for a message re-sent by

		 New blind carbon copy recipients for a message re-sent by

		 Places	 a  copy  of  a	 message  re-sent by into the sender's

		 A unique identifier of a message re-sent by This is  appended
		 by if the -msgid flag is set.

       Resent:	 Annotation added by when the -annotate option is specified.

		 Annotation added by when the -annotate option is specified.

       Replied:	 Annotation added by when the -annotate option is specified.

       Standard location of mail drop.

See Also
       Standard for the Format of ARPA Internet Text Messages (RFC 822)


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