That had been my experience for quite some time.  More recently it seems to actually have some effect.<p>As I&#x27;d just noted in another comment, many senders use a mail service provider, and a single bad actor can have very bad knock-on consequences, even for mail which doesn&#x27;t transit the MSP (SPF records listing MSP IP space).<p>For many major brands &#x2F; companies, unsubscribes work reasonably well.  I&#x27;ve seen some success with this, <i>don&#x27;t</i> offer email addresses generally, and flag the remainder as spam, with blackhole rules in my various filtering tools.<p>The larger problem with email is I simply don&#x27;t trust it any more.