Each email has an unsubscribe link, but my problem is that I don't know if these separate senders represent different email lists. In the past, some companies who've used this pattern have accepted my unsubscribe request on one list, but kept emailing me from another, as if I'm supposed to work out their marketing email list hierarchy in order to stop them spamming me. So these days I don't bother, I just select all and mark as spam when I see it.