Avoiding Spam attribution for video alarm notification in Mail.app
The solution : basically, using Mail app but not iCloud services.

use a regular ISP mail account (and not me.com) to send the message from the camera, incuding SMTP authentication, but change the apparent &quot;from mail:&quot; to a bogus one; e.g myAxis@me.com
use a regular ISP mail account for receiving the mail (and not me.com); e.g Pub@YourIsp.net
configure your ISP account Pub@YourIsp.net to consider myAxis@me.com as &quot;Not spam&quot;
set up Mail to retrieve Pub@YourIsp.net and set a rule to transfer it on your Mac based on sender : myAxis@me.com
You can create a bogus contact in the contact app (Axis : myAxis@me.com) that will make it easy to read in mail App

Advantage of this solution :

it works
you don't really need to create specific email account as you surely have already an account for spam mail (Pub@YourIsp.net)
you won't activate iCloud spam algorithm which identifies that myAxis@me.com is bogus and forces it to spam folder

This little trick might help you analyse other use cases where you get forced spam mails.