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The characteristic payload information of an MX record [1] is a preference value (above labelled "Priority"), and the domain name of a mailserver ("Host" above).. The priority field identifies which mailserver should be preferred - in this case the values are both 10, so mail would be expected to flow evenly to both onemail.example.com and twomail.example.com - a common configuration.
Returns all records of all types known to the name server. If the name server does not have any information on the name, the request will be forwarded on. The records returned may not be complete. For example, if there is both an A and an MX for a name, but the name server has only the A record cached, only the A record will be returned.
The most common types of records stored in the DNS database are for start of authority , IP addresses (A and AAAA), SMTP mail exchangers (MX), name servers (NS), pointers for reverse DNS lookups (PTR), and domain name aliases (CNAME).
The record type field is an abbreviation for the type of information stored in the last field, record data. For example: an address record (type A for IPv4, or type AAAA for IPv6,) maps the domain name from the first field to an IP address in the record data; a mail exchanger record (type MX ) specifies the Simple Mail Transfer Protocol (SMTP ...
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A DNS name server is a server that stores the DNS records, such as address (A, AAAA) records, name server (NS) records, and mail exchanger (MX) records for a domain name (see also List of DNS record types) and responds with answers to queries against its database.
A typical SPF HELO policy v=spf1 a mx ip4:192.0.2.0 -all may execute four or more DNS queries: (1) TXT record (SPF type was obsoleted by RFC 7208), (2) A or AAAA for mechanism a, (3) MX record and (4+) A or AAAA for each MX name, for mechanism mx. Except the first one, all those queries count towards the limit of 10.
MXlo means DNS resource records of the MX type [1] that have a value of localhost.The name comes from combining the MX from Mail eXchange and the lo abbreviation for a loopback networking interface, and is an anti-spam technique that is growing in popularity with network administrators who manage a large number of unused legacy domain names.