The US Postal Idiots
My submission was rejected because, get this, self-addressed stamped envelopes aren't allowed! I read the code and it certainly is under additional related material. This stuff is SOP for writers. The agents demand it be sent this way loose with the SASE or they won't reply. Both blockers were minority women oblivious to logic. They aren't doing their gender and ethnicity any favors by behaving this badly in a public job. I filed a complaint against the office.
Update: Several go-a-rounds with USPS reps. Each one cites a different incorrect interpretation of the code. Manuscripts are allowed yet none are bound by definition. Same with the related material: allowed as long as the separate postage is paid. With a self-addressed stamed envelope it is. Morons.