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How can I add another email address so they can receive Fresh Explorer alerts?

Hi, I need help with international SEO redirects. I'm going to have intelligencebank.com/au for Australian visitors and intelligencebank.com for the rest of the world. I would like to automatically redirect aus users that land on .com to .com/au and vice versa for non-australian users. 1. Which automatic redirects should I use: a) java script because it will allow US based google bots to crawl my /au website (bots won't read javascript so they won't be redirected) b) http redirects c) 301 redirects d) 302 redirects e) anything else? a) Should I still use rel alternate even though I only use english? b) if I should add rel alternate,  can I still keep my existing rel canonical tags that are use to avoid duplicate content (I use a lot of utm codes when advertising)