Not only that, but I have my own domain name which forwards anything@mydomain.com to my primary email. And to keep spam under control, I use a unique email for

Not only that, but I have my own domain name which forwards anything@mydomain.com to my primary email. And to keep spam under control, I use a unique email for each (low impact) service. Therefore, I often forget which email I used when signing up for that particular service (unless they sent me a conformation mail, then I can usually dig it up).