This is a follow-up question to What affiliation to put on an academic paper for alumni authors? Some time ago, I read a paper published in a journal owned by my employer which was very far-fetched. It espoused a very non-mainstream theory. It looked so far-fetched that I couldn't believe the journal would accept it, but I confirmed with the desk editor of that journal that it wasn't a mistake. I also saw the review - the reviewer agreed it was very speculative, but couldn't outright call it wrong, and so recommended acceptance.
I could think of reasons why the theory was wrong, so I wrote up a letter to the editor and submitted it to the journal.
Question: what's my affiliation? From aeismail's answer to the above question, my affiliation is where I did the research work. That makes my affiliation the publisher (however I was not contracted to do research work, and I did this on my own time). However there's potential conflict-of-interest here since I'm submitting to my employer's journal. If I listed my employer as my affiliation, it might seem that I've circumvented the normal peer review process. In practice the peer review process happened as normal, and I was not involved in it at all, but this would not be apparent to anyone not an employee of the publisher.
I got out of this dilemma by listing the university that granted my most recent degree. They maintain a university email address for life, so I used that. Nobody has complained, but I'd like to know if this was the right affiliation.