I'm using wordpress, in my website.
I can see an email (real or fake, who knows) of the person who left a comment, but I can't see if he is a feed subscriber or not. Some spams link to commercial and porn sites, and these I mark as spam, however there were two recently comments whose links seem personal, but I'm not sure and I haven't approved them just in case. I received comments from strangers, but often asking questions about the lovebirds, and these I approve. These two suspicious ones are very generic messages ("very good information" and phrases like that).