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Date Submitted: 08/14/2015 08:08 AM
IT135 Networks V Infrastructure
Joseph Vizena 010152
7/25/2015
MX and SRV Records
Domain Name Systems or DNS is a naming system for computers, services or any resource connected to the internet or private network. Most Prominently DNS translates numerical IP addresses to domain names making memorization by human users easier. In addition to this basic IP address to host name translation DNS also stores a record database and is maintained for other purposes. DNS contains a number of record types that facilitate other applications. Some of these record types include MX or Mail Exchange and SRV or Service.
MX or Mail Exchange record is a resource in the Domain Name System that specifies a mail server responsible for accepting email messages on behalf of a recipient’s domain, and a value is used to prioritize mail delivery if multiple mail servers are available. MX will specify how emails should be routed with Simple Mail Transfer Protocol or SMTP. When an email is sent from your email client such as Outlook and through the internet, the sending mail transfer agent MTA will search the DNS for a MX record of recipient’s domain name. This search returns a list of host names of mail exchange servers accepting incoming mail for that domain and their preferences. It then can be sent either directly to the target domain or to another email server that is providing a relay service and the SMTP connection is attempted. With the example target domain like something.tbd ending an email than the email will be delivered not to a host but to a mail exchanger server such as Exchange 7 or Exchange 13. This server is responsible for all mail for domain something.tbd because it’s denoted by a unique and very important MX record in DNS.
SRV or Service records point one domain to another domain using a certain destination port and allows specific services such as Instant Messaging and Voice over IP to be directed to a separate location. This separate location or specified...