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overcounting MX servers

2004-01-07 09:04:35
On Wed, Jan 07, 2004 at 08:31:52AM -0600, wayne wrote:
| 
| Anyway, one of the participants has done some checking and found that
| the SPF wizard at http://spf.pobox.com/wizard.html seems to do a very
| bad job of counting MX records.  Generally it over counts them.  For
| example, it says that midwestcs.com has 2 MX records, when it only has
| one.
| 

thanks for the note, i have updated the wizard's text to explain why it
overcounts them.

  midwestcs.com has 2 MX server names: mail and midwestcs.com.  The server
  or servers behind those names are allowed to send mail from
  midwestcs.com.  (A single machine may have multiple hostnames.  This
  wizard can't tell which hostname a machine will use in its HELO name.
  If a machine has multiple names, all of them are shown.)

It's hard to tell exactly how many MX servers a domain has.  If you have
three physical machines sitting behind some kind of clustering device so
that they appear to the world with one IP address, is that one MX server
or three?  If you have one physical machine multihomed on two networks,
with a total of three interfaces connected, and a different hostname, IP
address, andPTR entry for each interface, how many MX servers do you
have?

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