AOL used to allow users to email other users without using the @aol.com extension. Back in those days I (prior to any capacity to negotiate a sensible ISP, for

AOL used to allow users to email other users without using the @aol.com extension. Back in those days I (prior to any capacity to negotiate a sensible ISP, for the record) had an email that matched a common subject line that was inundated by people who typed their subject in the To line and then wrote an email.