@Arantor said:spam to let you know you have spam
Technically, no. I have an established relationship with my ISP, so it's not really spam. Plus, I'm pretty sure there's an option to disable it, if it bothered me.
@TwelveBaud said:I would whitelist the from address and blackhole anything via SMTP with that from address.
I don't think that would work with the system configured as-is. The mail goes through a few relays via ESMTP within the ISP before being dumped in my inbox. It looks like spam checking is the last step in the chain, for both the spam notification and regular mail:
Received: from foo.mx.example.com (...) by bar.spam.example.com (...) with ESMTP id ...
So the spam checker would always see it arriving by (E)SMTP, whether spoofed or not. DKIM might work, but I don't really know anything about it.