2023-06-29: 1.7.2 - Fixed confliting command line option
2023-04-10: 1.7.1 - updated the list of servers
2022-08-08: 1.7.0 - new option to specify nameserver to use for the DNS queries
2022-05-12: 1.6.4 - updated the list of servers
2021-12-16: 1.6.3 - accepts FQDN as host names
2021-06-01: 1.6.2 - fixed a bug with IPv6
2021-05-27: 1.6.1 - fixes the FQDN with IPv6 and fixes the output in case of timeouts
2021-05-27: 1.6.0 - show the FQDN if the host is specified with an IP address
2021-01-03: 1.5.7 - removed emailbasura.org from the documentation and default configuration
2020-11-30: 1.5.6 - bug fix with IPv6 addresses
2020-09-30: 1.5.5 - removed dynip.rothen.com from the documentation and default configuration
2020-05-26: 1.5.4 - removed dnsbl.inps.de from the documentation and default configuration
2019-12-24: 1.5.3 - fixes in the RPM spec file
2019-12-03: 1.5.2 - removed rbl.suresupport.com from the documentation and default configuration
2019-11-25: 1.5.1 - removed megarbl.net from the documentation and default configuration
2019-06-03: 1.5.0 - added the --url option
2019-06-02: 1.4.5 - removing spamcannibal.org from the documentation and default configuration (fixed)
2019-02-28: 1.4.4 - added the --append option
2018-05-30: 1.4.3 - removing spamcannibal.org from the documentation and default configuration
2018-05-25: 1.4.2 - removing dnsbl.cyberlogic.net from the documentation and default configuration
2017-07-17: 1.4.1 - Perl 5.26 support
2017-04-18: 1.4.0 - IPv6 support
2016-06-07: 1.3.8 - allowing Nagios::Plugins for older distributions
2015-02-01: 1.3.7 - now depends on Monitoring::Plugins (Nagios::Plugins
                    is deprecated)
2014-12-05: 1.3.6 - removed dependency on Data::Dumper
2014-09-21: 1.3.5 - fixed the default critical and warning range
2014-09-20: 1.3.4 - parameter validation fix
2014-08-09: 1.3.3 - parameter validation
2014-01-30: 1.3.2 - documentation and dependencies update
2013-09-26: 1.3.1 - disabled embedded Perl
2011-07-11: 1.3.0 - whitelisting support
2011-03-22: 1.2.2 - bug fix release (dependencies fixed)
2010-07-05: 1.2.1 - bug fix release (see Changes)
2010-04-08: 1.2.0 - improved parallel checks and several fixes
2009-10-27: 1.1.0 - parallel checks
2009-     : 1.0.2 - --retry command line argument to specify DNS retries
2009-01-06: 1.0.1 - Execution time in the performance data
2008-12-29: 1.0.0 - Initial release
