[Mimedefang] Slightly OT: Advice on updating MX record (was SMTP error return after DATA?)

[-ray]

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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