From: alex black (enigmaturingstudio.com)
Date: Fri Oct 07 2005 - 21:38:48 CDT

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hi all,

I'm planning a transition from an older (but perfectly functional)
postfix installation with virtual mailboxes to a new machine with more
power and much more sophisticated spam filtering.

I would like to avoid telling each one of my clients to configure the
new mail server separately and continue fetching mail from the old
server during the transition (which is a tried and true way of
switching). Instead, I'd like to either:

-configure postfix to forward all mail for a certain account to another
MTA (hm, this seems scary)

or, better:

-copy messages to the new machines as they arrive from the old machine
(just for a couple days while DNS propagates).

However, looking at the filenames in a virtual mailbox, they contain
the hostname of the machine. That worries me.

I'll be switching DNS, so for example:

mail.somedomain.com as 1.2.3.65
will become
mail.somedomain.com as 2.2.3.32

Any advice on the best "seamless" transition method?

please make sure to include my email in any responses, I'm subscribed
but digest only.

thanks,

_alex

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