Help: Customizing MX records

I have domain “”, which is currently served on AA Box dedicated server. DNS is currently pointed to “” and “”.
and config for BIND,
mail 14400 CNAME 14400 MX 0

If I change DNS to “” and so on, what is the setting (exact values) for MX record, so that only mail traffic points to the AAbox dedicated server?

Is this correct setting? 14400 MX 0

I am evantually move the email accounts to Dreamhost server, but I don’t want to move email server right now.

How should I customize MX records?

Thank you,

Thank you