Question about adding a domain alias in WHM

Hi:
Lets say I want to add a domain alias, second.com to my main domain first.com, so both domains point to the same site (but no redirection please, so what user types is what he sees). I'm just learning about DNS functions in WHM. For what I understand, do I simply go to:

WHM -> Edit a DNS Zone -> First.com

Then add a CNAME record for second.com pointing to first.com

Is that it, or do I need to do the same for MX as well? Email wise I need me@second.com and me@first.com to both point to the same mailbox as well.

Thanks!

 

 

 

 

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