So the way federation works is kind of odd, compared to what you might be used to. Basically, your blog itself is an “account” you can follow from the fediverse. In terms of using it in the fediverse, it’s the exact equivalent of a Mastodon account, i.e. people can follow it, receive posts, and favorite them. So just by having a Write.as / WriteFreely blog, you’ll have the exact thing you’re going for: anyone can search for
@email@example.com from Mastodon and directly receive new posts from your blog – no additional Mastodon account needed.
Here’s what that looks like for your blog:
Of course, what’s missing for now is the ability to see when people reply to your posts in the fediverse. We’ll support that in the future, but for now you might use a Mastodon account for this, since it supports more interaction than we do right now.