[Mimedefang] Slightly OT: Advice on updating MX record (was SMTP error return after DATA?)
-ray
ray at ops.selu.edu
Fri May 9 15:54:01 EDT 2003
On Fri, 9 May 2003, Michael Sims wrote:
> Does this sound reasonable, or am I making it too complicated? I'd
> appreciate any advice...
You should set your TTL on the MX records low, like 5 minutes. Then wait
your default TTL, normally 24 hours. Might wait 72 hours just in case.
You'll see the MX DNS traffic increase during this time. Then make the MX
change. Theoretically, the change should be propagated everywhere within
5 minutes.
In reality, it doesn't always happen like that, or i don't understand DNS.
Another thing we did was, at our linux firewall, redirect all port 25
requests destined for the old mail server to the new mail server. Worked
like a charm.
-ray
--
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Ray DeJean http://www.r-a-y.org
Systems Engineer Southeastern Louisiana University
IBM Certified Specialist AIX Administration, AIX Support
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