![]() The SPF record is updated accordingly, so that still can be used as an outgoing mail relay: .IN TXT'v=spf1 a: -all' .IN MX10 mail.lf.net. Now suppose that the administrator discovers that he cannot handle the growing mail load anymore, and therefore migrates mail handling to the ISP's mail server, mail.lf.net. This means that SPF-aware receiving mail transfer agents accept mail message. ![]() is also the outgoing mail relay for clients sending mail from the domain. Suppose publishes the following DNS records: .IN TXT'v=spf1 mx -all' .IN MX10. Let's look at an example to see what this means. DNS is distributed database with an optimistic replication protocol, which trades temporary lack of consistency for increased availability.
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