Two mail servers on the same domain

[Dusan]

David Botham <DBotham at OptimusSolutions.com> wrote in message news:<bpvklv$7fu$1 at sf1.isc.org>...
> bind-users-bounce at isc.org wrote on 11/24/2003 03:17:50 AM:
> > Dear all,
> > this is a quite newbie question, I think :)
> > We have an old mail server with about 200 users mail accounts.
> > We want to exchange it for the new one, and we are planning to use
> > following method, which we don't know if it would be correct.
> > We want to install a new machine on the same domain and to configure
> > mail there (postfix).
> > For example a user John Thomas has an account "jthomas" on the old
> > mail server. We would make a new account "johnthomas" on the new
> > running mail server.
> > In the DNS server we would have 
> > ourdomain.sk  IN  MX 10 mailold.ourdomain.sk.
> >               IN  MX 20 mailnew.ourdoamin.sk.
> > So our reasoning is that in the case somebody sends an email to
> > jthomas at ourdomain.sk it will go directly to maiold and when sending to
> > johnthomas at ourdomain.sk it will go to the mailnew.
> 
> 
> No.  The two mx RR you have above make all mail to any user @ourdomain.sk 
> to be delivered to mailold.ourdomain.sk.  However, if mailold.ourdomain.sk 
> is offline for some reason, mail would then  be delivered to 
> mailnew.ourdoamin.sk.
> 
> It is worth mentioning that lack of a valid user at a mail server does not 
> constitute an "offline" condition.  In other words, lack of the new email 
> address on the old mail server will not signal the remote sending MTA to 
> then try your backup mail server.
> 
> Try using aliases files on the old mail server to foward mail to the new 
> server in during your migration.  You will have to fork lift the current 
> mail files from the old server to the new server.  The finer details of 
> howto migrate mail should be directed to a list more appropriate to that 
> subject though.
> 
> I hope the explaination of MX RR's helped out.
> 
> 
> Dave...

Hi Dave,
thanks for your advice. I will try to and then inform the list
about....
Moreover, could you please provide me a "list more apropriate to that
subject" if you know such ?
Regards
Dusan

> 
> 
> > By this method we would create all accounts in the new manner...
> > Is this correct ?
> > And in the case it is not, how this should be done ?
> > Thank in advance for your advice
> > Regards
> > Dusan
> >