[Mimedefang] Slightly OT: Advice on updating MX record (was SMTP error return after DATA?)
-ray
ray at ops.selu.edu
Fri May 9 15:59:01 EDT 2003
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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