Re: General DNS config questions

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"Max C" <maxc246@xxxxxxxxx> wrote in message news:1180555591.925723.186130@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Just to be 100% clear, when I set up the A and MX records for
NSSCO_Spam, should I direct them both to www.xxx.yyy.37? I was under
the impression that the MX record worked better if it was mapped to a
host name rather than an IP.

No, no - you're right, it should be a hostname. You still set up the MX record to point to nssco_spam.nssco.com and then set up an A record for nssco_spam pointing to your .37 IP address.

After a couple of days, you're saying you'd get rid of the "mail" A
Record? If so, then that means you'd just adjust the "@" MX record to
point to the NSSCO_Spam A Record?

Right now you'll add an A record for nssco_spam and change your MX record to go to nssco_spam. When you're done, your zone will look like this:

A records
@ www.xxx.yyy.36 (Web server)
mail www.xxx.yyy.37 (spam filter)
www www.xxx.yyy.36 (Web server)
nssco_spam www.xxx.yyy.37 (spam filter)

MX records
Priority Host Goes To
0 @ nssco_spam

After a full day (or two to be safe - the default TTL for your zone is 1 day), you can remove the "mail" A record. By doing this you ensure that anyone on the Internet that has cached "mail.nssco.com" as your MX will still be able to resolve the hostname "mail" and send you messages while anyone who has NOT cached the MX record will get your shiny new nssco_spam hostname from an NX query.

If you're really paranoid you can keep the MX record for mail and set it to a higher priority (10 would be good) for the same amount of time before you delete it.

I'm just trying to be thorough. I don't want to screw this up.

I don't blame you. Better to be safe.

.

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