I have a doub about configuring suse for zimbra

in dns the mx record for the server is mail.sienic.site with A record mail 192.168.1.11, but in the hosts file suse setup the real hostname of the server in the hosts file as follow:

127.0.0.1 localhost
192.168.1.11 server03.sienic.site server03

(server03 is the real name of the server in /etc/hostname)

instead of

127.0.0.1 localhost
192.168.1.11 mail.sienic.site mail

in this scenario what would be the correct form of the hosts file?

the other thing is tha zimbra requires the first line to be

127.0.0.1 localhost.localdomain localhost

but suse default is

127.0.0.1 localhost

is ok to change to meet zimbra requirements or it will break things?