How does mx record work




















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Example of an A-record: Domain: copernica. MX-records Back to List of News. One of the most frequent questions we get through YippieMove relates to email routing. We touched briefly on this topic in the article Email — An introduction to email under the hood. Yet, I feel the need to elaborate on this a bit more. In this article we'll put IMAP and POP3 aside, as those are protocols for retrieving email, and has nothing to do with the routing of your email which is a common misconception. There is only one thing that affects the routing of your email, and that is the MX-record.

Each domain and sub-domain need to have an MX-record in order to receive email. For instance example. A typical MX-record would look something like this: example. This means that all emails for example. This requires that 'mail. This is intended to ensure that no outdated records are used.

Should the time lapse, the client must again request the record from the name server. The TTL is specified in seconds. This field frequently does not appear in the actual record. Instead, the time for the complete zone is defined at the beginning of the zone file.

The class field is optional, as nowadays only the internet is possible. However, both networks are today no longer in operation. For this reason, the field remains either empty or invariably contains the IN abbreviation. The field relating to priority is a special feature of MX records. Many administrators — in particular those of larger projects — have several mail servers running in parallel. In doing so, however, distribution is not necessarily supposed to occur evenly. For this reason, priorities can be assigned.

The server with the lowest value has the highest priority and is selected first. The data field finally contains the mail server name. This is also specified in the FQDN format. In the record, all fields follow one another within a line. As an example, we are using the made-up mail server example. A suitable email address for our purposes would be something like user example. As you can see here, the duration of the information is valid for the entire zone.

In the individual records, the field no longer needs to be integrated for this reason. In this example, we initially have an A record that the domain links with an IP address.

Then three MX records follow. You may notice that this only differs for the subdomains. The first two mail servers have the same priority levels in this example.

Both tasks are thus distributed accordingly between both. Mail server 3 is then first addressed if the other two can no longer handle the load — for example, due to a failure.

Register a domain name. A number of web services are available for performing an MX record lookup. On the website, you can enter the domain that contains the MX records you would like to check. On the following page, you then need to change the record type from A to MX. The former is supposed to facilitate the designation of DNS information.

The latter guarantees that the information is not manipulated by a criminal third party.



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