Søren Hilmer wrote: > ... I am adding a > DNSServer.findARecords method to do it (basically a copy/paste of > findMXRecords).
I find this very interesting, and I am working on code to deal with it. But I don't want to step on Søren's toes.
Within a day or two, I hope to post some code here which works -- as far as I have been smart enough to test it. Then I hope to benefit from the list's critical review of that code. I don't know enough about DNS to feel sure of myself here.
I want to confirm my understanding of "preferences". As Noel cited, RFC 2821, section 5, says:
The destination host (perhaps taken from the preferred MX record) may be multihomed, in which case the domain name resolver will return a list of alternative IP addresses. It is the responsibility of the domain name resolver interface to have ordered this list by decreasing preference if necessary, and SMTP MUST try them in the order presented.
I believe that these preferences pertain to the host targets of the MX records. The hosts are ranked.
But, for any given host, if that host is multihomed, then the IP addresses for that host are not ranked. They can be returned in any order within the list of IP addresses for that host. Does that sound right?
Rich Hammer
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