Re: Any Postfix solution for mail server migration?

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Thu, Jan 21, 2016 at 02:36:25PM -0700, Swift Griggs wrote:
> 
> How can this be done? I've Googled and there only seem to be vague hints,
> but no solid method to migrate in the way I'm proposing.
> 
> ---[ Problem Description ]---
> Server "Oldserv" = old MTA system I want to get away from
> Server "Newserv" = new MTA I want to migrate TO.
> 
> 1. Mail to flow to Newserv first.
> 2. If mail is for a local user, the mail stays on the system.
> 3. If the mail is for an unknown user it's forwarded to Oldserv.
> -----------------------------
> 
> I don't want the header getting re-written. So, I see people doing things
> like setting up aliases so that userpart%mydomain.com@localhost gets changed to
> userpart%oldserv.mydomain.com@localhost. That's unacceptable. It'll hork up the user's
> mail experience and re-write addresses that were fine the way they are.

If it's in the alias file this doens't rewrite the headers, only
the envelope. The mail in the final mailbox will still have
the original To: or Cc:

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--