They don't take anonymous outside contributions, as least, not without putting their name in the byline (rendering the anonymous bit incorrect); they do publish

They don't take anonymous outside contributions, as least, not without putting their name in the byline (rendering the anonymous bit incorrect); they do publish their articles under pseudonyms -- like Babbage, Bagehot, etc. -- or initials only, as they feel the article and author represent the entire magazine and not just the views of the journalist who wrote the piece.