ckbinarsys(1M)                                               ckbinarsys(1M)

NAME
     ckbinarsys - determine whether remote system can accept binary mes-
     sages

SYNOPSIS
     /usr/lib/mail/surrcmd/ckbinarsys [-S] -s remotesystemname
                                      -t contenttype

DESCRIPTION
     Because rmail can transport binary data, it may be important to deter-
     mine 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 speci-
     fied. 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.

OPTIONS
     -s remotesystemname
               Name of remote system to look up in /etc/mail/binarsys

     -t contenttype
               Content type of message to be sent. When invoked by rmail,
               this will be one of two strings: text or binary, as deter-
               mined 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(4), mailsurr(4).








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