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    Command:

    rblsmtpd

    
    
    
    

    SYNOPSIS

           rblsmtpd opts prog
    
    
    

    DESCRIPTION

           opts is a series of getopt-style options.  prog consists of one or more
           arguments.
    
           Normally  rblsmtpd  runs  prog.   prog is expected to carry out an SMTP
           conversation to receive incoming mail messages.
    
           However, rblsmtpd does not invoke prog if it is told to block mail from
           this  client. Instead it carries out its own limited SMTP conversation,
           temporarily rejecting all attempts to  send  a  message.  Meanwhile  it
           prints one line on descriptor 2 to log its activity.
    
           rblsmtpd  drops the limited SMTP conversation after 60 seconds, even if
           the client has not quit by then.
    
    
    

    OPTIONS

           -t n   Change the timeout to n seconds.
    
           Blocked clients
    
           If the $RBLSMTPD environment variable is set and is nonempty,  rblsmtpd
           blocks mail. It uses $RBLSMTPD as an error message for the client. Nor-
           mally rblsmtpd runs under tcpserver(1); you can use tcprules(1) to  set
           $RBLSMTPD for selected clients.
    
           If $RBLSMTPD is set and is empty, rblsmtpd does not block mail.
    
           If $RBLSMTPD is not set, rblsmtpd looks up $TCPREMOTEIP in the RBL, and
           blocks mail if $TCPREMOTEIP is listed.  tcpserver sets up  $TCPREMOTEIP
           as the IP address of the remote host.
    
           -r base
                  Use  base  as  an RBL source. An IP address a.b.c.d is listed by
                  that source if d.c.b.a.base has a TXT record.  rblsmtpd uses the
                  contents of the TXT record as an error message for the client.
    
           -a base
                  Use  base  as an anti-RBL source. An IP address a.b.c.d is anti-
                  listed by that source if d.c.b.a.base has an A record.  In  this
                  case rblsmtpd does not block mail.
    
           You  may  supply  any number of -r and -a options.  rblsmtpd tries each
           source in turn until it finds one  that  lists  or  anti-lists  $TCPRE-
           MOTEIP.  It  also tries an RBL source of rbl.maps.vix.com if you do not
           supply any -r options. See http://maps.vix.com/rbl/ for  more  informa-
           tion about rbl.maps.vix.com.
    
           If you want to run your own RBL source or anti-RBL source for rblsmtpd,
    
           -B     (Default.)  Use  a 451 error code for IP addresses listed in the
                  RBL.
    
           -b     Use a 553 error code for IP addresses listed in the RBL.
    
           -C     (Default.) Handle RBL lookups in a ''fail-open'' mode. If an RBL
                  lookup fails temporarily, assume that the address is not listed;
                  if an anti-RBL lookup fails temporarily, assume that the address
                  is  anti-listed.  Unfortunately,  a  knowledgeable  attacker can
                  force an RBL lookup or an anti-RBL lookup to  fail  temporarily,
                  so that his mail is not blocked.
    
           -c     Handle  RBL  lookups in a ''fail-closed'' mode. If an RBL lookup
                  fails temporarily, assume that the address is listed (but use  a
                  451  error  code even with -b). If an anti-RBL lookup fails tem-
                  porarily, assume that the address is not anti-listed (but use  a
                  451  error  code  even  if a subsequent RBL lookup succeeds with
                  -b). Unfortunately, this sometimes delays legitimate mail.
    
    
    

    SEE ALSO

           tcpserver(1), tcprules(1), tcprulescheck(1),  fixcrio(1),  recordio(1),
           rblsmtpd(1),  tcpclient(1),  who@(1),  date@(1),  finger@(1), http@(1),
           tcpcat(1), mconnect(1), tcp-environ(5)
    
           http://cr.yp.to/ucspi-tcp.html
    
                                                                       rblsmtpd(1)
    
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