Comment 0 for bug 5292

We have already had at least one instance of a user setting their preferred email address to their @ubuntu.com one.

I suspect we need to special case this somehow - probably involving a new email address type of ALIAS, which would be an email address which we know redirects to another one in our database with a CONFIRMED or PREFERRED status.

Or just refuse to allow @ubuntu.com email addresses into the EmailAddress table, maybe listing the @ubuntu.com email address on the relevant screens for people who have signed the code of conduct. I say maybe as we might not want to advertise these until PersonNameBlacklist is implemented.