CaptchaSourceImageBase
Users having difficulty getting CAPTCHAs to work within Movable Type should pay special attention to this tag. In order to generate captchas, Movable Type needs access to a number of PNG images that come with MT. These images are found in the mt-static directory. The value of this configuration directive should be set to the absolute path on the filesystem to the images/catcha-source directory in mt-static.
Example
CaptchaSourceImageBase /path/to/mt/mt-static/images/captcha-source

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