setting up round robin

[jeff donovan]

greetings

I'm not having any success setting up round robin dns for my imap
servers.
here is what I have done,

options {
	multiple-cnames yes;
}

imap1.bar.net.	60	IN	A	192.168.1.1
imap2.bar.net.	60	IN	A	192.168.1.2
imap3.bar.net.	60	IN	A	192.168.1.3
imap4.bar.net.	60	IN	A	192.168.1.4

imap.bar.net		60	IN	CNAME		imap1.bar.net.
imap.bar.net		60	IN	CNAME		imap2.bar.net.
imap.bar.net		60	IN	CNAME		imap3.bar.net.
imap.bar.net		60	IN	CNAME		imap4.bar.net.


getting errors about multiple RR's, and that the option multiple
cnames is obsolete

okay,..
so um, is there a better way to achieve this goal ?

TIA

-j