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What are MX entries?

April 26, 2017entries MX

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What are MX entries?

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Maybe we should first step back and explain DNS. DNS stands for Domain Name Server, and it is used to map Domain Names with IP addresses. For example www.google.com maps to IP address 207.196.25.11. (In fact this is actually a DNS A record.) DNS MX records do a similar thing, they map the Domain to the responsible Mail Servers. So for example the MX records for google.com are: smtp1.google.com – preference 10 smtp2.google.com – preference 10 smtp5.google.com – preference 10 smtp3.google.com – preference 40 smtp4.google.com – preference 40 This means that emails to anybody@google.com will be mapped to one of those mail servers. Incidentally to list these MX records you can use either of two approaches: 1) You can examine the MX entries of a domain by using one of the following online DNS tools: here (Type in Domain (e.g example.com) and set Query Type to MX), here (Type in Domain (e.g. example.com) and set Query Type to MX) or here (Type in Domain (e.g. example.com) and set Query Type t