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I joined SpamController Service. Why will be treated as spam by the system when I send an email to my colleagues?

The system of SpamController for assessing spam is not only depends on the Email sender's address, but also the contents of email (included email header, keywords, image, etc.).
 
The system will give a score according to the contents of email. When the assessment score exceed the particular score of system, the email will be treated as spam.
 
If user wants the particular email address which is received normally, user should add the particular email address in whitelist.