Domain Alias - Mail not forwarded

I was able to create a Domain Alias (with Synchronize DNS Zone with primary domain, Mail Service, Web Service, Redirect with the HTTP 301code switched on).

LONGDOMAINNAME.com is my current domain.
SDN.com is the alias.

Created DNS entry for SDN.com in Namecheap.com the same way I created for LONGDOMAINNAME.COM.

I am thinking if I don't do this at namecheap.com, how will it know that where it should send the requests. Note that I am NOT FORWARDING the inptx.com at namecheap registrar...

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