plucky (3) Mail::Milter::Module::ConnectMatchesHostname.3pm.gz

NAME

       Mail::Milter::Module::ConnectMatchesHostname - milter to accept/reject connecting hosts matching
       regex(es)

SYNOPSIS

           use Mail::Milter::Module::ConnectMatchesHostname;

           my $milter = new Mail::Milter::Module::ConnectMatchesHostname;

           my $milter2 = &ConnectMatchesHostname; # convenience

           $milter2->set_message('Connecting hostname %H looks like a dynamic address');

DESCRIPTION

       This milter module rejects any connecting host whose hostname contains one of a group of built-in
       patterns that match the IP address of the connecting host.  This is normally used to detect dynamic pool
       addresses.

       Currently the following patterns embedded in the hostname are considered matching, where 10.11.12.13 is
       the IPv4 address of the connecting host.  In the following cases, the string must be preceded by a non-
       digit character or otherwise must be at the start of the hostname.

           010.011.012.013. (optionally without internal dots, or with - in place of .)
           013.012.011.010. (optionally with - in place of .)
           10.11.12.13. (optionally without internal dots, or with - in place of .)
           13.12.11.10. (optionally with - in place of .)
           0A0B0C0D (hexadecimal, ignoring case)

       More specific patterns are anticipated to be added in the future.  Because of this, if you use
       ConnectMatchesHostname, pay attention to this perldoc manual page when updating to a newer version of
       Mail::Milter.

       One final note.  ISPs can and do use "dynamic-looking" reverse DNS entries for what they consider to be
       legitimate server addresses.  This is not ideal, and may require embedding this module in a Chain set to
       "accept_break" with regular expressions; for example:

           my $milter = new Mail::Milter::Chain(
               &ConnectRegex(
                   '\.fooisp\.com$',
               )->accept_match(1);
               &ConnectMatchesHostname,
           )->accept_break(1);

METHODS

           new()

           Creates a ConnectMatchesHostname object.

           set_message(MESSAGE)

           Sets the message used when rejecting connections.  This string may contain the substring %H, which
           will be replaced by the matching hostname, and/or the substring %A, which will be replaced by the
           matching IP address.

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

BUGS

       In Sendmail 8.11 and 8.12, a milter rejection at "connect" stage does not allow the reply message to be
       set -- it simply becomes "not accepting messages".  However, this module still attempts to set the reply
       code and message in the hope that this will be fixed.

       The implementation of this module could be much more efficient.

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 98:
           You can't have =items (as at line 110) unless the first thing after the =over is an =item