Category Archives: DNS


We have multiple links available to check if the mail server are correctly configured. To check reverse DNS Check MX records for domain Check if the IP/domain is blacklisted for spam Check if … Continue reading

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Setting up Master Slave DNS server

The DNS ( Domain Name System ) is a distributed system, used for translate domain names to IP and vice a versa Network Scenario for this Setup Master DNS Server IP: ( ) Slave DNS Server IP: … Continue reading

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HOWTO Virtual Mail Hosting on CentOS 6.x – Postfix MySQL Dovecot PostfixAdmin Amavisd-new Spamassassin Clamav DKIM SPF

Introduction This is an advanced email server configuration. This configuration will allow you to serve multiple domains on one server. This howto will allow you to setup a server that is one of four mail server types: Mail server with … Continue reading

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Forwarder zone

If you want a name server to forward queries for certain domain names to another name server, use a zone statement of type forward to tell a BIND server to forward queries for domain names that end in the specified suffix to particular … Continue reading

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Stub zones

Stub zones are a little like slave zones, in that the name server periodically checks with its master server to see if the zone’s serial number has changed. But instead of transferring the whole zone, it retrieves just the zone’s … Continue reading

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