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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.
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.
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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.
If you're repeatedly getting delivery failure errors when sending messages to AOL Mail customers, it is most likely due to spam blocking on AOL's servers.
RFC 973 replaced these records with the MX record. MF 4 MAILA 254 MB 7 RFC 883 Not formally obsoleted. Unlikely to be ever adopted (RFC 2505). MB, MG, MR, and MINFO are records to publish subscriber mailing lists. MAILB is a query code which returns one of those records. The intent was for MB and MG to replace the SMTP VRFY and EXPN commands ...