To do this, I sent an email to discourse.replies.okfn+new@gmail.com.
I guess it’s kind of an awkward email address for new topics 
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Why a @gmail.com? We could have a @okfn.org, no?
Can we add a category through e-mail?
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To my knowledge, there is no way to add a category via email.
We’re still thinking through @gmail.com vs @okfn.org question. 
I meant add a topic to a category, sorry.
I discovered how to do it in the configuration panel. Open Knowledge Brasil is already configured to receive topics through the email discourse.replies.okfn+okbr@gmail.com.