I'm still not receiving any emails. When I tried to update my email address, I got asked to enter my email address a second time, but every attempt has generated an error. Below is what I tried:
1) repeating my "new" email address (which I've been using a couple years) got rejected, so I decided to try my previous email addresses;
2) my last email address which was with a now defunct email service provider (mail.com) also got rejected;
3) my first email address (provided by the ISP I had until mid-2012) also got rejected;
4) my yahoo.com email address which I haven't used for years, because of repeated problems with yahoo deleting my emails -- I only remember this account because it is linked to my YIM (Yahoo Instant Messenger) account -- also got rejected.
I'm out of ideas about how to update my email address and I can't figure out how to find out which of the email addresses I've had over the years is the one linked to my GC forums account.