Description

   Many gateways impose a limit on the maximum size message they
   will process. Because the mail server is often called upon
   to transmit large files it frequently can run afoul of such
   limitations.

   The MAXIMUM command provides a way around such limitations. When
   a maximum size is set, messages larger than that size will be
   fragmented (split) into multiple messages, each message no larger
   than the specified maximum size. The fragmentation scheme is
   compliant with the message/partial type described in RFC 2046
   (MIME, Part Two).

   The possible values for size-units are:

   BYTES  size-value specifies the maximum number of bytes allowed
          in a single message. This value includes the initial
          header attached to the message. (Note that the header
          can increase in size through the addition of header lines
          during routing.)
   BLOCKS size-value specifies the maximum number of "blocks" of
          bytes allowed in a single message. The size of a block
          is a PMDF configuration option controlled by the system
          manager with the PMDF BLOCK_SIZE option; its default value
          is 1024 bytes. As with BYTES, this value includes the
          initial header attached to the message.
   LINES  size-value specifies the maximum number of lines allowed
          in a single message. This limit is independent of the
          number of bytes or blocks. It is necessary to have an
          independent limit because some gateways limit message size
          based on both line count as well as overall size.

   The limits specified with the MAXIMUM command apply to all
   subsequent SEND commands in the same message. The imposed limits
   can be overridden with a subsequent MAXIMUM command. And, of
   course, limits you imposed in previous messages sent to the
   server have no effect on subsequent messages which you might
   send.

   Both line count and byte size limits can be simultaneously
   imposed. For instance, the two commands:

   MAXIMUM BYTES 10000
   MAXIMUM LINES 1000

   Will result in messages larger than either 10,000 bytes or 1,000
   lines being automatically fragmented into smaller messages, each
   containing fewer than 10,000 bytes and 1,000 lines.

   See the SEND command description for further information on the
   usage of this command.