MX record
An
MX record or
Mail exchange record is a type of resource record in the
Domain Name System (DNS) specifying how
Internet e-mail should be routed. MX records point to the servers to send an e-mail to, and which ones it should be sent to first, by priority.
When an e-mail message is sent through the Internet, the sending
mail transfer agent makes a DNS query requesting the MX record for the recipient's
domain name, which is the portion of the
e-mail address following the "@". This query returns a list of
host names of
mail exchange servers accepting incoming mail for that domain, together with a preference number. The sending agent then attempts to establish an
SMTP connection to one of these servers, starting with the one with the smallest preference number, delivering the message to the first server with which a connection can be made. If no MX records were present, a second request is made for the
A record of the domain instead.
The MX mechanism provides the ability to run multiple mail servers for a single domain and the order in which they should be tried, increasing the likelihood that mail may be delivered and providing the ability to distribute the processing of incoming mail across multiple physical servers. This ability to run multiple mail servers easily is proving very valuable for high-availability clusters of inexpensive mail gateways that can then process hundreds of messages per second -in aggregate- to quarantine or remove
spam and/or viruses.
The MX mechanism does not grant the ability to provide mail service on alternative
ports, nor does it provide the ability to distribute mail delivery across a set of equal-priority mail servers by assigning a weighting value to each one. As of
2004, some
MTAs, most notably
exim, now support the use of
SRV records for publishing the
IP addresses, ports, priority, and weights of mail servers.
A primary point of confusion is how the priority system works for MX selection. The relative priority of an MX server is determined by the preference number present in the DNS MX record. When a remote client (typically another mail server) does an MX lookup for the domain name, it gets a list of servers and their preference numbers. The MX record with the smallest preference number has the highest priority and is the first server to be tried. The remote client will go down the list of servers until it successfully delivers the message or gets permanently rejected due to an unreachable server or if the mail account does not exist on that server. If there is more than one entry with the same preference number, all of those must be tried before moving on to lower-priority entries.
A favorite technique of
spammers is to connect to the lowest priority MXs for a domain (those with the largest numerical value) in an attempt to avoid any anti-spam filters that may be running on the primary (highest priority) MX.
Computer viruses have also been known to employ this technique in an effort to avoid anti-viral software.
*
LOC record*
SRV record*
Email hub: MX based load-balancing and simple failover.
* RFC 974 (1986), Mail Routing and the Domain System (obsolete)
* RFC 2821 (2001), Simple Mail Transfer Protocol
*
"Moving a message closer to a remote recipient", part of
Daniel J. Bernstein's guide to Internet mail infrastructure
*
Understanding MX Records* Tools to find the mail servers used by an e-mail address:
**
Mail Test tool shows the exact order that MX records are used**
Domain Mail Server/Exchanger (MX Records) Lookup
