I am receiving email notices of people who have joined our site. But they are not showing up in the database. They have very unusual email addresses and I now believe that they are ficticious and that they are not really from a person going to our site and clicking on Join Us. The from address on the email is "WordPress" <email@example.com> and appears to be legitimate. How can I find out where these emails are being generated and how do I stop them? Here are a few examples of the content of these notices:
Username: PreciousC E-mail: firstname.lastname@example.org
Username: RossFink E-mail: email@example.com
Username: gerdi E-mail: firstname.lastname@example.org
I orginally thought that it was problem with the Participants Database plugin as the registrants don't show up in the database at all. But now I don't believe that to be true. I hope someone can help me with this issue.