, ya i heard about that...when i was looking to see if anyone already posted this issue, I don't like to post a topic about something someone already posted. However this is a different issue, its McMaster sending a message to everyone on the subscription list, then people who want to opt out, hit 'reply' and it ends up sending it to everyone. I find that funny too, how people say "stop replying to this etc.." yet there doing that and everyone gets the message, its a whole cycle.
I think its the way McMaster's newsletter server works, there like one email address which redirects it to everyone on the subscription list, since your actual email address is not listed in the "sent to" bar, which only consists like 3 email addresses.
Correct me if I am wrong, I am just speculating, if this is the case then McMaster should seriously fix this issue as it seems to have been a problem last year too, as you mentioned and i read somewhere on here.