Keeping that in mind, the following email is how not to respond to a rejection. I sent out a large number of rejections today, as June's submissions so far have tallied around two hundred, and I expect to see the same amount in July. Only half of my current reading period is over, and I still have a great deal of work ahead. I enjoy reading the things that you send me, and I'm also eternally grateful that it's taken a relatively long time (about a year, in fact) for someone to send me a gem of a response like this:
Actually my poem about men participating in Atomic Testing at sea is the best think you have ever received. The reason you don't like it is because you don't have a literary mind. You should be on ebay selling fake Jewelry. Good luck.
The best think, even! This kind of behavior will get you automatically blacklisted on my watch, plain and simple: not because it offends me (my thin-skinned days with regard to petty and/or nasty emails, at least, are long behind me), but because it's juvenile and entirely uncalled-for. We respond to your submissions with cordiality and respect whether we're rejecting your work or accepting it, and we expect the same in kind.