[K12OSN] Moving our email server

[Burke Almquist]

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First change the TTL on the dns record so it's much shorter than the  
default (like down to and hour or half hour instead of a week). After  
waiting for the old ttyl to expire, you can copy your old mailboxes  
to the new server and shutdown the old server. As soon as you have  
the new server running you can change your dns TTL back to a more  
reasonable level.

On Jan 5, 2007, at 7:37 AM, mrok12osn at eastgranby.k12.ct.us wrote:

> In the near future, I am going to need to move our email server  
> from one
> ISP (Cox Cable) to another (CEN - Connecticut Education Network) and I
> have never done this before.  Our email server is FC5 (postfix)  
> built from
> the K12LTSP CD's.
>
> I'm wondering whether I can just put a second ethernet card in the  
> email
> server so both ISP's IP addresses (old and new) are active, update
> iptables, and then notify the ISP that maintains our DNS pointers to
> repoint to the new IP address.  Then after a couple of days, I can  
> just
> shutdown the old IP address.
>
> Will this work?  Are there any issue with postfix?  Any help or
> suggestions are appreciated.
>
> Mark Orenstein
> East Granby, CT School System
>
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