I know the parser is using the info provided for that IP, my point was, why does the parser not filter out donaldduck[at]hotmail.com and discard it as fake.
Whenever I question the reliability of the parser at locating referenced websites, people are very quick to pipe up that this is not what the parser is for, and all the efforts are put in to detecting the source of the spam. My point is that quite often it does not do that very efficiently. Who wants to send spammers confirmation that their email address is live, and actively reports spam and yet the parser allows this with surprising ease. I know you can untick specific addresses, but surely anything [at]gmail.com or [at]hotmail.com or [at]geocities.com that isn't abuse[at] or postmaster[at] is fake, the parser should be smart enough to discard anything that is obviously fake.