Good morning to everyone!!!

I want to configure corectly my dns server for exchange mails to other domains, i have finish my installation on opensuse 11.2 and zimbra server.

I know the situations are 2

1st i configure the MX and A records on my server and the
2nd isp provider or some else server have the 2records

wich of the following is the correctly?

can anyone help me?

many thanks