I've been an affiliate for 11 years. I think I've received such an email (with everyone in the TO field) at least once from very major network.
A ShareASale merchant did it on Jan 26 2010. Only about 70 emails, and from the domains (quite a few major coupon sites) I figure it was just a list of the top SAS affiliates they sent it to
Like many people I've figured there's a lot of useful info in those email addresses. I keep them all. If I had more time (as some of you might have), I'd be studying every site (if it's not obvious, a Google search for the email addy should find the merchant) for clues as to how I could do better.
A ShareASale merchant did it on Jan 26 2010. Only about 70 emails, and from the domains (quite a few major coupon sites) I figure it was just a list of the top SAS affiliates they sent it to

Like many people I've figured there's a lot of useful info in those email addresses. I keep them all. If I had more time (as some of you might have), I'd be studying every site (if it's not obvious, a Google search for the email addy should find the merchant) for clues as to how I could do better.