Interesting read. Archive: https://archive.today/N1U74 From the post: >>Yesterday evening, we were hit by a run of phish spam that I would call 'vaguely customized' for us, for example the display name in the From: header was "U of T | CS Dept" (but then the actual email address was that of the compromised account elsewhere that was used to send the phish spam). The destination addresses here weren't particularly well chosen, and some of them didn't even exist. So far, so normal. One person here fell for the phish spam that evening but realized it almost immediately and promptly changed their password. Today that person got in touch with us because they'd started receiving email bounces for (spam) email that they hadn't sent. Investigation showed that the messages were being sent through us, but in an alarmingly clever way.