Does it just default to the email address on my Cox account?
Forum notifications would use whatever email address you used to establish your account on the Forum.
-----
Forum ID is not the same as my Cox ID.
I don't believe it needed to be the same as your Cox userID. The Forum server would be different than the server with your Cox account
-----
Could something about that history explain why I am not receiving emails?
If the first Forum account is different from your second account, the first account probably still exists but you're just not using it. Again, whatever email address you used to establish your second account should be receiving any email from the Forum.
-----
Is there a way for me to check the email address used for my Forum ID?
I scoured my settings and didn't see any reference to what email address my account on the Forum is using.
Moderators can open your profile in the Forum to research your information. I once asked a question and I think it was Jonathan to have copied-and-pasted my last name from my account into the post. Your SMTP address may be on an admin page for the Forum.
Edit: It took some searching...
