I just had SpamSieve accept as “good” an e-mail spoofing Amazon.com. Things looked reasonably professional, but the real address for the URL listed was totally bogus.
It would be nice to have SpamSieve be able to do checks on the visible vs. real URLs and flag the message as spam if they don’t match (or at least don’t have the same starting path). Since the rest of the message and addresses might be ok, I’m usually afraid to add these kinds of messages to the corpus since I wouldn’t want to miss a real piece of e-mail from these companies in the future.