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.