Redirecting links after changing primary to secondary domain

I recently went through the process of updating my DNS settings as requested by Zoho, which means that now www.mysite.org is my primary domain whereas before it had been secondary. There are a bunch of legacy links out on the web pointing to http://mysite.org/specific-page.html, that now get redirected to the root at http://www.mysite.org/ without going to specific-page.html. How can I fix this? I can't see a way, my DNS settings don't touch individual pages, and the redirects in the zoho control panel don't touch the domain. I've have thought this should happen automatically, but if not, what should I do?

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