I log into SE with my Google Mail account, and I regularly get updates of the form "2 new items in your Stack Exchange inbox" to that account. That's great.
However, when I try to subscribe to a tag I get the following:
Which would be great - except that's not my email address - mine is email@example.com not firstname.lastname@example.org (missing 't') - my question is, how do I change the address that the superscription is going to? (I'm presuming I was asked for it once and mistyped it...)
EDIT- Okay - building on hjpotter's answer (which sent me in the right direction but wasn't the key thing)
The problem was that I only appeared to have an 'edit' tap on my stackoverflow profile - all other profiles were 'slaved'(?) to that one...