ckbinarsys(1M)                   DG/UX R4.11                  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
       mail(1), uux(1); binarsys(4M), mailsurr(4M).


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