ckbinarsys(1M)    MISC. REFERENCE MANUAL PAGES     ckbinarsys(1M)



NAME
     /etc/mailckbinarsys - 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  tran-
     sport layer agent (uux, SMTP, etc.)

     ckbinarsys consults the file /etc/mail/binarsys for informa-
     tion  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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