Global whitelist

i just setup junk filtering on my domain. is there a way to setup a global whitelist? it seems that the only way to setup whitelists is to log into the webmail for each specific mailbox and set it up there. i want to setup up one unified whitelist that will effect all my mailboxes. is this possible?

I searched around to find a new way to do this. But it seems this is the only way. Either log into webmail or mailbox.

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