Reader John R. agrees with assumption in the column, saying that for these signatures attached at the bottom of the message to carry any weight, they need to be validated. To prove his point, he attached a signature to his message. But, the signature was one he pulled off an old CERT alert. Obviously, I don't check digital signatures that vigorously. Failure to understand the difference between the userID and the domain portions of an e-mail address.
Naive people receive the email and think it is from a trusted company.
Loosely related to the e-mail insecurities are some Web link tricks, but this is for another time. Maybe we'll have to start signing our e-mails. If repeated, failed telnet requests are made to the switch, the device could fail to accept traffic and commands until rebooted. This tool fixes the problem in the registry key. A similar vulnerability affects Windows NT 4.0 as well as Version 4.0's RAS Administration Key and MTS Package Administration key.