To an Administrator, there is nothing more peaceful than a stable and optimized DNS server. The moment there is a wrong configuration, the server wakes up and starts crying, sites and email goes down. An important part of keeping DNS that way is properly setting up the SOA records.
What are DNS Records. DNS records or Zone files are used for mapping URLs to an IPs. Located on servers called the DNS servers, these records are typically the connection of your website with the outside world. Requests for your website are forwarded to your DNS servers and then get pointed to the WebServers that serve the website or to Email servers that handle the incoming email.
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DNS, SOA …
Domain Keys, DomainKeys Identified Mail
omainKeys is an e-mail authentication system (developed at Yahoo!) designed to verify the DNS domain of an E-mail sender and the message integrity. The DomainKeys specification has adopted aspects of Identified Internet Mail to create an enhanced protocol called DomainKeys Identified Mail (DKIM). This merged specification is the basis for an IETF Working Group which plans to guide the specification toward becoming an IETF standard.
DomainKeys is a method of e-mail authentication. Unlike some other methods, it offers almost end-to-end integrity from a signing to a verifying Mail Transfer Agent (MTA). In most cases the signing MTA acts on behalf of the sender, and the verifying MTA on behalf of the receiver.
DomainKeys is independent of Simple Mail Transfer Protocol (SMTP) routing aspects in that it operates on the RFC 2822 message — i.e., the transported mail data, header and body — not the SMTP envelope defined in RFC 2821.
Note that DomainKeys does not prevent abusive behavior; rather, it allows abuse to be tracked and detected more easily. This ability to prevent some forgery also has benefits for recipients of E-mails as well as senders, and “DomainKey awareness” is programmed into some E-mail software.
Since 2004, Yahoo! has signed all of its outgoing E-mail with DomainKeys and is verifying all incoming mail. As of 2005, Yahoo! reports that the number of DomainKeys-verified e-mail they receive exceeds 300 million messages per day.
Google also uses DomainKeys to sign emails sent from users of its Gmail service, actually going live with it about a month before Yahoo! did. The ISP EarthLink also uses DomainKeys.
From Wikipedia, the free encyclopedia:
DomainKeys Identified Mail is a method for E-mail authentication. It offers almost end-to-end integrity from a signing to a verifying Mail transfer agent (MTA). In most cases the signing MTA acts on behalf of the sender by inserting a DKIM-Signature header, and the verifying MTA on behalf of the receiver, validating the signature by retrieving a sender’s public key through the DNS.
The DomainKeys specification has adopted aspects of Identified Internet Mail to create an enhanced protocol called DomainKeys Identified Mail (DKIM). This merged specification is the basis for an IETF Working Group which has guided the specification towards becoming an IETF Proposed Standard.
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