Ok, so here's what I understood. Please bear with me... I am new to this.. > Obscurity in posts = <Groan!> > > Olga, > > If you indeed have two MX records for a single domain like... > > mydomain.com 1d IN MX 1 hosty.mydomain.com. > mydomain.com 1d IN MX 2 hostx.mydomain.com. This is indeed what I have right now. > > Then... > > Hosty: > 1) Should have the physical mailboxes for all users in mydomain.com > 2) The domain name "mydomain.com" should be listed in > /etc/mail/local-host-names. > Yes, all of the domains on Y are listed in /etc/mail/local-host-names and the mailboxes are there. > Hostx: > 1) Should not have any physical mailboxes for mydomain.com. > 2) Should have mydomain.com listed in /etc/mail/relay-domains > 3) Should have the following entry in /etc/mail/mailertable: > mydomain.com esmtp:[hosty.mydomain.com] > > NOTE: The brackets are required to stop sendmail from using DNS to look up > the MX records for final delivery. This would cause an MX loop without the > brackets. > 1. - no physical mailboxes are present on X for domains on Y. 2 & 3 -- Will need to setup /etc/mail/relay-domains and /etc/mail/mailertable. > 4) Should have a complete list of valid mailboxes for hosty so that if an > e-mail does come in for mydomain.com on hostsx, it can reject it instead > of > sending a DSN back to a forged address. Thus clogging up your mail queue. > I > do this using LDAP queries, but you could create a list of virtual users > to > compensate. > Are these valid mailboxes set up in /var/spool/mail ? > Repeat the above for each domain that you moved. > > The above is just the minimum that is required to implement a backup MX > server. You would also need to configure both the primary/backup sendmails > to reject/accept/rbl inbound e-mail identically. > This part I will have to learn as well. Thank you for detailed explanations. This helps a lot. Olga > Steve Cowles > > > -- > fedora-list mailing list > fedora-list@xxxxxxxxxx > To unsubscribe: http://www.redhat.com/mailman/listinfo/fedora-list >
