ckbinarsys(1M)                                               ckbinarsys(1M)


   NAME
         ckbinarsys - determine whether remote system can accept binary
         messages

   SYNOPSIS
         ckbinarsys [-S] -s remote_system_name -t content_type

   DESCRIPTION
         Because rmail can transport binary data, it may be important to
         determine whether a particular remote system (typically the next hop)
         can handle binary data via the chosen transport layer agent (uux,
         SMTP, etc.)

         ckbinarsys consults the file /etc/mail/binarsys for information on a
         specific remote system.  ckbinarsys returns its results via an
         appropriate exit code.  An exit code of zero implies that it is OK to
         send a message with the indicated content type to the system
         specified.  An exit code other than zero indicates that the remote
         system cannot properly handle messages with binary content.

         The absence of the binarsys file will cause ckbinarsys to exit with a
         non-zero exit code.

         Command-line arguments are:
         -s remote_system_name
                          Name of remote system to look up in
                          /etc/mail/binarsys
         -t content_type  Content type of message to be sent.  When invoked by
                          rmail, this will be one of two strings:  text or
                          binary, as determined by mail independent of any
                          Content-Type: header lines that may be present
                          within the message header.  All other arguments are
                          treated as equivalent to binary.
         -S               Normally, ckbinarsys will print a message (if the
                          binary mail is rejected) which would be suitable for
                          rmail to return in the negative acknowledgement
                          mail.  When -S is specified, no message will be
                          printed.

   FILES
         /etc/mail/binarsys
         /usr/lib/mail/surrcmd/ckbinarsys

   SEE ALSO
         mailsurr(4), binarsys(4)
         mail(1), uux(1) in the User's Reference Manual.







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