NAME

       Mail::Milter::Module::MailDomainDNSBL - milter to accept/reject mail whose sender domain
       matches a DNSBL

SYNOPSIS

           use Mail::Milter::Module::MailDomainDNSBL;

           my $milter = new Mail::Milter::Module::MailDomainDNSBL('foo.spamlist.dom');

           my $milter2 = &MailDomainDNSBL('foo.spamlist.dom'); # convenience

           $milter2->set_message('Mail from %M disallowed');

DESCRIPTION

       This milter module rejects any mail from a sender's domain (in the MAIL FROM part of the
       SMTP transaction, not in the From: header) matching a given DNS Blocking List (DNSBL).  It
       can also function as a whitelisting Chain element; see "accept_match()".

       The check used by this module is a simple "A" record lookup, via the standard
       "gethostbyname" lookup mechanism.  This method does not require the use of Net::DNS and is
       thus typically very fast.

METHODS

           new(DNSBL)

           new(DNSBL, MATCHRECORD[, ...])

           new(DNSBL, SUBREF)

           Creates a MailDomainDNSBL object.  DNSBL is the root host hierarchy to use for
           lookups.  Three methods of matching can be used:

           If no additional arguments are provided, the match succeeds if there is any address
           entry present for the DNSBL lookup; the values are not examined.

           If one or more MATCHRECORD values are supplied, they are string representations of
           IPv4 addresses.  If any of these match record values is the same as any address record
           returned by the DNSBL lookup, the match succeeds.

           If a SUBREF (reference to a subroutine; may be an anonymous inline "sub{}") is
           supplied, it is called for each of the address records returned by the DNSBL lookup.
           The subroutine should return 0 or undef to indicate a failed match, and nonzero to
           indicate a successful match.  The subroutine receives two arguments: a binary-encoded
           four byte scalar that should be transformed as needed with "inet_ntoa()" or "unpack",
           and the domain name being checked by the DNSBL.

           accept_match(FLAG)

           If FLAG is 0 (the default), a matching DNSBL will cause the mail to be rejected.

           If FLAG is 1, a matching DNSBL will cause this module to return SMFIS_ACCEPT instead.
           This allows a "MailDomainDNSBL" to be used inside a "Mail::Milter::Chain" container
           (in accept_break(1) mode), to function as a whitelist rather than a blacklist.

           This method returns a reference to the object itself, allowing this method call to be
           chained.

           ignore_tempfail(FLAG)

           If FLAG is 0 (the default), a DNSBL lookup which fails the underlying DNS query will
           cause the milter to return a temporary failure result (SMFIS_TEMPFAIL).

           If FLAG is 1, a temporary DNS failure will be treated as if the lookup resulted in an
           empty record set (SMFIS_CONTINUE).

           This method returns a reference to the object itself, allowing this method call to be
           chained.

           set_message(MESSAGE)

           Sets the message used when rejecting messages.  This string may contain the substring
           %M, which will be replaced by the matching e-mail address, or %L, which will be
           replaced by the name of the matching DNSBL.

           This method returns a reference to the object itself, allowing this method call to be
           chained.

AUTHOR

       Todd Vierling, <tv@duh.org> <tv@pobox.com>

SEE ALSO

       Mail::Milter::Object

POD ERRORS

       Hey! The above document had some coding errors, which are explained below:

       Around line 77:
           You can't have =items (as at line 89) unless the first thing after the =over is an
           =item