Piss-off auto-generated rejection:
"Dear Fellow Writer,
Thank you for your submission to Gulf Coast. We're very sorry that your work doesn't fit out needs at this time. Due to the volume of submissions we receive, we are unable to comment on individual submissions, but we look forward to reading your work in the future and wish you the best of luck in placing it elsewhere.
Blow us hard."
I invented that last part.
But then there's this, handwritten, a little further down the letter...
"Jamie, We really liked "Rubato," even if it didn't make the final cut. Please send again! -SB"
That's from Sean Bishop, Managing Editor.
It's almost better than an acceptance into a magazine, because it's a personal acknowledgment. Yes, these are people, not litera-robo-prototypes, reading your poems. And, yes, they like them. And, yes, you should keep writing.