I recently had a paper desk-rejected (i.e., by the editor without review). I was disappointed sure, but more annoyed because no reason was given at all (verbatim email with redactions):
I am sorry to tell you that we will not be able to publish your paper titled "TITLE." JOURNAL receives more manuscripts than we have space to publish, and we have to make choices among some interesting papers.
I realize this is disappointing news. I hope this rapid decision will at least allow you to submit your paper elsewhere without delay, and that you will not be discouraged from submitting your future research papers to JOURNAL.
Is this a reasonable desk-rejection email? Is it reasonable to reply asking for specific rejection reason(s)?