There are three distinct Massmail lists:
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massmail_student
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massmail_staff
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massmail_faculty
Some massmails are directed to all three lists, some may be directed to just one or two. If you are affiliated with UIC in more than one way (for example: you are an employee but also enrolled in classes) you may be subscribed to more than one list and may receive multiple messages as a result.
The same holds true for Official and Urgent lists.