Which spam filter setting matters for forwarding addresses?
If you use a forwarding address to direct mail to a mailbox, the spam filter setting of the the forwarding address is used when mail arrives for that address, and the mailbox spam filter setting is ignored.
For example, if you create email@example.com as a forwarding address that sends mail to a firstname.lastname@example.org mailbox, and someone sends mail to email@example.com, the setting that matters is the spam filter setting for firstname.lastname@example.org.
The spam filter setting for email@example.com would not make any difference for that particular message (but would be used if the message were sent directly to firstname.lastname@example.org, of course).
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