Correct, I did indeed have to turn those bits off. But in my case, the roll
forward / roll back advantages outweighed the disadvantages. I had also set
a short ttl prior to moving, so my real dns changes could action fast.
Probably a combination of everything would be a whole solution.
Short ttl's
Multiple mx records
Port forwarding
-Andy-
-----Original Message-----
From: Renaud Allard [
mailto:renaud@llorien.org]
Sent: 13 November 2007 12:31
To: andrew.johnson@???
Cc: 'Ian P. Christian'; 'Jonathan Addleman'; exim-users@???
Subject: Re: [exim] switching mail servers
Andrew Johnson wrote:
> I once did a move where the servers were hosted on somebodyelses
> network and they were geographicaly seperated. I used IPTables to
> forward connections from the old server to the new one so the
> switchover was fully under my control, then the DNS changes followed
> later - this allowed for easy rollback.
>
>
>
While this may sound great, you should take great care of spamscanning when
using such a solution because all mails will appear as coming from your old
mailserver. This means you should not deny on helo/ip couple or dns
verification. You will also not be able to check for blacklists.
