The Hotmail/MSN email service allows users to report individual emails as spam. In their interface, when an email is displayed, there is a button labeled "Junk" (or "Report & Delete") above each message. Clicking that button automatically "reports this message as spam".
In Hotmail:
or
In Windows Live Mail:
But what does that mean exactly?? For legitimate email providers like us, it means that the message is immediately transmitted to us as something the recipient does not want, and we are required to delete the recipient's address from any email lists. Failure to do so will ultimately get us blocked as non-responsive spammers and all our mail to Hotmail/MSN would henceforth be blocked.
The problem is, that button in the Hotmail/MSN software, IS RIGHT NEXT TO THE DELETE BUTTON! Thus it's common for users to click it in error - but there is no way for us to know it was done in error.
So, on purpose or in error, if you click that button above a message we sent you, we get a forwarded complaint and you will be unsubscribed. If you re-subscribe, all will be fine unless/until it happens again.