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Well, presumably, if the author's last name is Pornin and your spam filter is pretty basic (or overzealous).

"contains some analysis"

I wonder how it would cope with Scunthorpe

Or your name is "Olivia Gray". (True story, corporate mail filter blocked all that person's email)

Why? 50 Shades? Something else?

Remove the space from her name and then look for a word in the middle that is commonly associated with spam emails.