[ahje]

You should try working at an abuse desk for an business providing email services at some point. :)

You are, of course, absolutely right re. spam and rightfully so. On the other hand, I regularly get spam reports re. 100% legitimate mails, often in the middle of longer email conversations and so on, and where one side of the conversation marks entire email threads as spam.

We always follow up on spam complaints and the one thing we do get often in cases like that is that the other party only wanted to delete the emails and didn't realise there were other consequences.

Yes, there's a lot of people that knows how to use the "Mark as spam button". I still, however, maintain the position that a lot of other people don't know how to use such features.