moving mail system from one ISP to another

["alexis bory" <abory@g2ms.com>]

Hello,

I have to control the transfert of the mailboxes
of one of my customers from his old ISP to his
Mother-Company-Centralized-Corporate-Lotus-Notes.

I wonder if abruptly changing the MX for his domaine
wouldn't cause any trouble. Is it possible to configure
a forward in the old MTA before changing the MX ? I
mean this to avoid trouble during the time all the DNS
get the rigth record.

If any of you know the place of a good doc about this
kind of operation...

TIA

alexis


That's not so much off-topic :
I plan to do the same thing with my own domains from my
old ISP to one of my Lovely-Debian-Made-Exim servers