This is frustrating, to say the least!
There has been a spate of comment spam recently on this site. You won’t have seen it, for I delete it before it gets anywhere, but my attempts to pinpoint the source and close it down have so far come to naught.
1. The originating email address is fictitious, and any mail sent to it fails to be delivered.
2. Normally it would be possible to reach the administration at the sites referenced by the spammer, but both the addresses I have tried – info@sitename, and webmaster@sitename – result in a failed delivery.
It is possible to view the sites referenced, however, so they are definitely there.
Looking at their webpages in text mode is no help either. Neither of the two sites I have looked at give an originating url, which is certainly not standard practice.
So be aware, spammers are gaming the system!
I don’t know if WordPress could help us out here at all? I will go to the Commons, reference this post, and ask if anything can be done.