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After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
Keep in mind that Domain Authority is a Moz metric, and not a metric that the search engines use for ranking. It's correlated with how well things tend to rank, but shouldn't be used as the final judgment for a link. Chapter 7 of the Beginner's Guide to SEO at http://moz.com/beginners-guide-to-seo deals with links and can give some good ideas of how to get started.
Total External Links are all of the links to the site.
External Followed Links are just those links to the site that are followed (they do not have a "nofollow" tag added to the link).