----- Original Message -----
From: "Chris Huff" <chuff@???>
To: <exim-users@???>
Sent: Friday, May 28, 2004 9:41 PM
Subject: [Exim] dual redundant server setup
I want to install a more redundant exim setup at work. Im not sure about one
thing though. If I want dual email servers running at the same time behind
firewall or just on the internet, do I have to make the MX record for both of
them weighted the same?
eg: mail1.me.com will be set at 10 and mail2.me.com will be set at 10 as well?
;; ANSWER SECTION:
me.com. 1H IN MX 10 mail1.me.com.
me.com. 1H IN MX 10 mail2.me.com.
<snip>
-----------------------
Chris,
As I understand it mail servers will always try and deliver to the server with
the lowest MX preference first (10 in your example). If this server does not
respond in then tries the next lowest MX (usually 15 or 20, but doesn't matter
as long as it is a higher number). It carries on like this until no other
servers are left and will eventually defer delivery.
If you specify the same MX preference, some times you will find the server or
DNS do a round-robin lookup and this can be used for basic load-balancing.
Are both of your servers going to be on the same or different IP's?
Regards
Lee
