These are my links for 24 mag 2013 through 29 mag 2013:

• DNSViz | A DNS visualization tool – DNSViz is a tool for visualizing the status of a DNS zone. It was designed as a resource for understanding and troubleshooting deployment of the DNS Security Extensions (DNSSEC). It provides a visual analysis of the DNSSEC authentication chain for a domain name and its resolution path in the DNS namespace, and it lists configuration errors detected by the tool.
• intoDNS: checks DNS and mail servers health – IntoDNS checks the health and configuration and provides DNS report and mail servers report. And provides suggestions to fix and improve them, with references to protocols’ official documentation.
• Master & Slave PowerDNS – LinuxManage.com – In this short tutorial we will show you how to configure powerdns running as master and slave. For this tutorial purpose, master powerdns host will have ip address 192.168.56.3 and hostname ns1.example.com, slave ip: 192.168.56.4 and hostname: ns2.example.com
• Sendmail relay configuration on AIX | Leave No Bit Unturned – This document describes how to set up a Sendmail e-mail gateway or relay which will be able to process incoming mail and route it to different mail servers based on domain information. The routing table is based on the Sendmail mailertable feature instead of the usual MX record based routing. This will come handy when there is a need to route mail internally in a different way than externally.