Hi all, I'm new in the forum. I'm working with Zimbra 8 OSE and I need to protect some Distribution Lists to only receive emails from internal users. My scenario:

Domain: domain.com
Domain Alias: domainalias.com
DL: example@domain.com

zmprov grr dl example@domain.com all sendToDistList

That command protect my DL from external users. So, if someone from outside (external email) sends to example@domain.com the message is rejected. But if it's sends to example@domainalias.com the message is received.
My question is how can I protect this DL from external users including domain aliases too?.

Sorry for my english and thanks in advance.