I got another rejection letter in the mail, and this one was by far the most insulting. This letter—or rather the absence of a letter—was the lowest rejection I’ve gotten thus far. An empty envelope from a publisher came to me with a big postal stamp on it that read RECEIVED EMPTY OF CONTENTS. So either the publisher forgot to enclose a letter, or it fell out before reaching the post office, or they did not deem me worth their time and effort to enclose a proper rejection letter. They just sent the envelope.
Oh well, at least I can cross the publisher off my list and wait for the next one.