Two mail servers on the same domain
Dusan
dkulisie at truni.sk
Wed Nov 26 07:35:59 UTC 2003
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
> >
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