Earlier quoted context omitted.
Nope, not morally. Once you send me a message, it's mine. I can tell anybody I want you sent me a message. I can post it publicly if I want.
> Once you send me a message, it's mine Only at the most primitive level of morality. Over that basic layer, I'd still consider how the publication of the message may affect the other person. For example: Do you think it's morally OK to publish nudes that your partner sends you? I don't think it should be illegal, but only a massive asshole would publish their (ex) partner's nudes.
If you send me unsolicited commercial messages, I'm gonna feel no compunction about publicizing that you're a spammer.