ckbinarsys(1M)        UNIX System V(Essential Utilities)         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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