I think it comes from the parallels to physical bulk mailing. I usually get sales flyers, various "junk" mail and the not-as-often "we've moved funds from one a

I think it comes from the parallels to physical bulk mailing. I usually get sales flyers, various "junk" mail and the not-as-often "we've moved funds from one account to another because a check didn't clear" from my bank. I equate most of these to something that would come from a no-reply email. Also, I do believe it's possible to have a send only mailbox that won't even accept incoming mail. It would drop the mail on the floor without you knowing.