Disabling a domain alias from accepting email?

Hi:
Lets say I have a site with two domains (1 formal and one alias) all pointing to the same site. Once I create an email address account, obviously emails to:

me@domain.com AND
me@domainalias.com

both work. My question is, is there an easy way to disable me@domainalias.com for accepting emails (so they bounce) without affecting the main email account? I'm getting a lot of spam for the later, and thought I'd temporarily disable it.

Thanks,

 

 

 

 

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