basic MX question

[fddi]

Hello I have a question.

I am going to start in production environment a bunch of 3 mail servers 
for my domain, let'say mydomain.com

I need to install a X509 certificate on each server in a way that upon 
x509 authentication thunderbird
 or whatever MUA won't complain about hostname different from 
certificate subject name of the mail server,
and I also need round robin feature to have SMTP traffic load balanced 
between different SMTP servers.


what is the best option ?

option 1:

		IN	MX	10 mx.mydomain.com
		IN	MX	10 mx2.mydomain.com
		IN	MX	10 mx3.mydomain.com
;
;
mx.mydomain.com.	IN	A	10.10.10.25
m1.mydomain.com.	IN	A	10.10.10.26
m2.mydomain.com.	IN	A	10.10.10.27




option 2:


		IN	MX	10 mx.mydomain.com


mx.mydomain.com.	IN	A	10.10.10.25
			IN	A	10.10.10.26
			IN	A	10.10.10.27
mx1.mydomain.com.	IN	A	10.10.10.26
mx2.mydomain.com.	IN	A	10.10.10.27



are both option correct and have the same effect ?

thank you

Rick