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A Question about the pobox.com wizard

2003-12-14 10:27:57
Guys,

I ran through the http://spf.pobox.com/wizard.html yesterday.
Things went well enough.  But then it said something interesting
about my DNS setup:

    This should also appear in DNS:

    chrome.jdl.com. IN TXT "v=spf1 a -all"
    jdl.com. IN TXT "v=spf1 a -all"
    mail.jdl.com. IN TXT "v=spf1 a -all"
    www.jdl.com. IN TXT "v=spf1 a -all"

Interesting.  I gues that begs the question about the
earlier statement:

    jdl.com has 4 MX servers that receive mail for jdl.com.
    Do they also send mail from jdl.com?

I was curious as to what the other 4 receivers were, or how
it came to this conclusion.  In particular, there are several
machine names in my jdl.com domain, among them (www, chrome, mail,
ftp, cvs, loghost, etc).  Why did it pick on www, chrome and mail?

So, I thought: Hmm.  It does make some sense to supply SPF records
for chrome.jdl.com and mail.jdl.com too, and maybe www.jdl.com.
So I added them.  (I think the world should be able to see them
by now too.)

I reran the wizard this morning, basically expecting it to *confirm*
that what I set up was sane.  That is, if it thinks I should have
records for those machines, it should have queried for them, seen
them, an then said something like:

    This should also appear in DNS:

    chrome.jdl.com. IN TXT "v=spf1 a -all"
    jdl.com. IN TXT "v=spf1 a -all"
    mail.jdl.com. IN TXT "v=spf1 a -all"
    www.jdl.com. IN TXT "v=spf1 a -all"

    And they do, so this is good.

But how did come to the conclusion of those 4 MX receivers?

jdl

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