One of the key problems is that both gmail and Yahoo UIs actively encourage users to report messages as spam rather than unsubscribing. Yahoo is particularly bad at this; it's common for me to receive spam reports from yahoo on an entirely double-opt-in social site I run. My reaction there is to remove the reporter from all lists because the amount of damage a single spam report can do is immense; a single spam report can block delivery for weeks at a time to the 10k others that legitimately requested messages. Hotmail/outlook/live is much the same in encouraging spam reporting over unsubscribe, however, their penalties are not as excessive as Yahoo's.
> One of the key problems is that both gmail and Yahoo UIs actively encourage users to report messages as spam rather than unsubscribing.
I think this is, generally, the correct approach. There isn't really a salient reason to discriminate between "email I don't want from someone I don't know" ("true spam", if you will), and "email I don't want from someone I do know" (aggressive newsletter campaigns et al). Spam is the button to send a signal that you got an email you didn't want.
> My reaction there is to remove the reporter from all lists because the amount of damage a single spam report can do is immense; a single spam report can block delivery for weeks at a time to the 10k others that legitimately requested messages.
This is the system working as intended to me, as the customer of the email service. I like that my email provider is throwing their weight around to put the fear of God into bulk senders and forcing them to think about how this campaign will impact their sendability. I would much rather annoy the hell out of bulk senders than cede emails to spammers like we have with phones.
There is one case where differentiating makes sense: Sometimes users sign up for newsletters, want the newsletters, would re-confirm if asked... and later change their mind and no longer want those newsletters. Here, marking as spam is unreasonable.
In most other cases (e.g. newsletters sent based on a tiny pre-checked checkbox or without asking for consent), the spam button is of course the right tool.
