Hmmm, very interesting situation.
Here's the fix:
Wotcher! please create yourself an account on @ passport.mobilenations.com don't use the exclamation mark as that's not allowed (bear with me). Just use Wotcher ping me here when you have.
Then I can link that passport account with this IM account and, given the delay, change the passport username.
Email Links
With regard to the email links we had a problem on the site where emails being sent without the domain name so that the browser didn't know they were link and if it did it thought they were local to your email client.
Alerts/Notifications
Obviously without a passport account to manage them it all fell over. Once we have the above sorted it will be a lot easier, you set defaults to always not be notified if you want.
Regards
Steph