I'd been hearing about folks who sent pro-Democratic letters to the editor, via email, to the Daily News-Record only to have them bounce back. These folks told be they'd double checked the address and found it to be correct. Most email delivery failures come back fairly quickly, sometimes within minutes. All of these bounce backs from the DNR are coming back days or even a week or more after the original email was sent. In my case, it was seven days, three hours, and four minutes later.
Given the right wing bias of the editors of the DNR and the fact that I am the third person who I know who has experienced this, and the returned emails come back too late to try again... I have concluded this is probably a case of "bounce back censorship."