Hi Len,
Does IPSwitch pay you?
-Mark McDonald
[EMAIL PROTECTED]
The Siteserver Network!
Voice: 800.610.9856 Ext. 231 - Fax: 888.333.2710
-----Original Message-----
From: Len Conrad [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, September 19, 2000 12:17 PM
To: [EMAIL PROTECTED]
Subject: RE: [IMail Forum] DNS and backup mailserver
>But domain.com is resolvable. It resolves to an IP address on our server.
>The secondary MX record resolved too. It was only the primary MX record for
>the domain that didn't resolve.
??? the query is "give me the MX records for domain.com". The
domain.com file contains these records. It the query returns only
one "MX 30" record, then the resolver doesn't know that the "MX 10"
and "MX 20" records are missing, and so will try to deliver to "MX 30".
What the mail server does depends completely on what MX records are
returned to it by it local resolver/DNS client.
There is no MX query result that says "hey, here's MX 30, but sorry,
there's more MX records in here with higher MX priority but I can't
retrieve them". MX 30 is all the sending mail server has and it will
deliver to that, because 30 will be the highest priority preference
number in the MX records received.
But if the mail sender got back an
MX 10 hostnameB
MX 20 hostnameB
and then couldn't reach hostnameB (for whatever reason) then it would
try to reach hostnameB.
Len
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