[Lula] Mail server ip changed issue.

[Alan Ptak]

Kim,

You need a backup mail server (exchanger), preferably on a different  
network, that will automatically accept mail whenever your primary  
mail exchanger is not available to receive mail. You need to do two  
things:

1. Arrange for the backup MX service.

I've used dyndns.com as a backup MX service for several of my  
clients. It's not expensive ($30/year). Some ISP's offer this service  
for free. Great for you if they do, otherwise you can google for  
other options.

2. Configure your DNS in advance of the transition

You need to add the backup exchanger to your zone file with a higher  
preference number than your primary mail server. Eg, http:// 
www.dyndns.com/services/mailhop/howto.html#backmx

Set this up several days (if possible) before changing your mail  
server configuration. Once you see that the DNS changes have propagated:

a) change your mail server configuration. Incoming mail will be  
directed to the backup MX rather than getting bounced back to the  
sender.
b) test your mail server configuration to ensure that it works as  
expected. This is important.
c) update the DNS zone file again with the new IP for your mail  
server. The backup MX will (eventually) pick up the changes from its  
own DNS queries and forward the stored messages to your server for  
final delivery.

Testing is important. If your mail server is broken when the backup  
MX delivers the stored mail, mail could get rejected and bounced to  
the senders.

Regards,

Alan


On Jun 28, 2006, at 5:20 PM, Titu Kim wrote:

> Hello,
>      I wonder how to solve the mail bounce issue
> during the process of switching a mail server from one
> ip to another(same dns name). DNS changes take a while
> for the latest ip to be refreshed. So, before new ip
> information about the mail server is refreshed to
> other dns server, all the mail sent between the gap
> will be bounced. Any idea?
>
> Thanks
>
> Kim TITU.
>
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__
Alan Ptak
V: 310.488.8606
E: aptak at transitiva.com



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