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

[-ray]

On Fri, 9 May 2003, -ray wrote:

> In reality, it doesn't always happen like that, or i don't understand DNS.

Sorry to reply to my own post. :)  What i've seen, and assume, is there 
are a lot of misconfigured/non-compliant DNS servers out there that cache 
records longer than they should.  But i'd be interested to hear others' 
take on this.

> 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.

This is how we did that:

iptables -t nat -A PREROUTING  -p tcp -i eth0 -s 0/0 -d 1.2.3.4 --dport 25 
-j DNAT --to 5.6.7.8:25

-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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