I got this twice while trying to post a message I left open for... a week or so.
Seems coming from Bad Behaviour?
It was answering to these two topics:
http://www.elkarte.net/community/index.php?topic=736.msg7700#msg7700
http://www.elkarte.net/community/index.php?topic=1089.msg7696#msg7696
Yup thats a bad behavior reject message.
Did you try contacting elkarte with that key ;D
Its been awhile since I looked at that code, but I think it has a 24hr? timer for some post events, so if it takes you longer than that to reply, ummm
Good to know it's kind of the intended behaviour! :D
And.. no I didn't try to contact nospam@... :P