You know what it might be: maybe the person is a niche marketer and is going to pretend to be multiple people to sell their product to the newsletter's audience. That happens all the time. Account 1 will ask for recommendations, then account 2-6, all held by the same person, talks up the spammer's product. Although, I don't know exactly how it would work with a newsletter, I know this is very common when comment spamming.
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