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.
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