Since the RFC requires that the SMTP-sender use the order given in the A record query, the DNS server is free to carefully manipulate its balancing based on any method, including round robin DNS, mail server load, or some undisclosed priority scheme. one that knows how to deliver to the relevant user's e-mail mailbox is typically one which is the most preferred. backup MX or secondary MX, usually keep the messages in a queue waiting for the primary server to become available.
If both servers are online or in some way connected to one another, the backup MX will typically queue a message briefly and immediately forward it to the primary MX.
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Resource records are the basic information element of the Domain Name System (DNS).
They are distinguished by a type identification (A, MX, NS, etc.) and a DNS class (Internet, CHAOS, etc.).
MX can be used to distribute delivery across equal-priority mail servers.
This phrasing can be confusing, and so the preference number is sometimes referred to as the distance: smaller distances are more preferable.
In DNS records, typically, the preference number is set and shown - but often erroneously labeled "priority".
A common misconception about the MX preference ordering is that it is intended to increase the likelihood that mail may be delivered; however, merely having multiple MX records with the same preference provides this benefit.
For example, if an MTA looks up the MX records for example.com, and the DNS server replied with only mail.with a preference number of 50, then the MTA will attempt delivery of the mail to the server listed.
In this case, the number 50 could have been any integer permitted by the SMTP specification.
A mail exchanger record (MX record) is a type of resource record in the Domain Name System that specifies a mail server responsible for accepting email messages on behalf of a recipient's domain, and a preference value used to prioritize mail delivery if multiple mail servers are available.