If you receive a rejection letter from a professional publication or an academic journal, or really any other reputable publication where the editors are likely to be busy people and are not your personal friends - and whether or not they have taken the trouble to send you more than a rejection slip - it's usually best not write back arguing that the wrong decision has been made. You're unlikely to get them to change their minds. Unless there are special circumstances of some sort, it only makes you look like a clueless amateur. Absent those special circumstances, doing this tends to make it less likely that you'll be taken seriously next time.
I do mean an outright rejection, not a revise and resubmit, where of course there are issues that might need clarification before you can revise, and so on.
Some people don't know this, so perhaps it's worth stating it in public now and then. It goes with "Use double spacing as the default unless otherwise requested" and "Don't send your manuscript on scented paper."
Just a word to the wise...