James A. Donald wrote:
No one is going to check for the correct three letter
combination, because it is not part of the work flow, so
they will always forget to do it.

Humans tend to notice patterns. We easily notice mispelngs. Your experience may be different but we found out in testing that three-letters can be made large enough to become a visually noticeable pattern.

Reversing the point, the fact that a user can ignore the three-letters is useful if the user forgets them. The last thing users want is one more hassle. The idea is to give users a way to allay spoofing concerns, if they so want and are motivated to, or learn to be motivated. Mark Twain's cat was afraid of the cold stove.

Ed Gerck

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