Like I said I have not really attempted to test the new feature(stop forum spam).
Setting it back to the default manual setting may or may not prove that is what is happening.
I just considered it could be what is deleting the registration queue, If it finds a spammer attempting to register.
But I would suspect more that it is some type of email spoofing:
http://en.wikipedia.org/wiki/Email_spoofingThe only way I know to check would be to actually login to the email account entered in:
CP>Primary Settings
Board Email Address:
All emails being sent out will come from this address.
Send one to yourself.
Then when you receive it dig through the header(option selection) and see where it came from and how it got to you.
You may need to dig a little to find evidence it was sent from you.
If you receive a email that is not from that account's outbox then you can probably assume it is spoofed.
I just got one from my brother yesterday.
It all looked legit from his corporate email account.
But the content of the body of the email did not jive.
This also could be a virus from someone elses computer that is using their address book to send email using spoofed info and that user is not aware it is happening.