The posting policy for fedora-devel-list seems to have recently changed from "moderate non-subscribers" to "non-subscribers get a bounce notification". Unfortunately the bounce notification has the helpful text:
"You are not allowed to post to this mailing list, and your message has been automatically rejected."
...which sounds a lot like "you have been blacklisted", especially when occurring due to an unannounced policy change.
The bounce notification should say *why* the mail is being rejected, especially when the reason is "you are not subscribed".