Comment by SethKinast

I actually added them to my "spammy recruiters" Sieve rule because I was getting so many. The combination of these rules catches a LOT of recruiter spam; most importantly, it seems that most of the recruiters that configure their tooling to automatically nag 3 times (once per week) use one of these packages, so I get to ignore them as well.

Filtering ant.amazon.com keeps order emails and such while discarding any mail sent from recruiters (though it would likely also filter mail from non-recruiters if you actually correspond with someone at Amazon).

    if anyof (
      body :text :contains "znsrc.com",
      header :contains "user-agent" "Nylas",
      exists "X-Ashby-Stage",
      header :contains "message-id" "ant.amazon.com",
      exists "X-ZenSr-ID"
    ) {
      fileinto "INBOX.spam";
      stop;
    }