22. The system of claim 17 , wherein the instructions further comprise instructions that when executed cause the processing element of the data analytics computer system to: store the extracted features in a database.
22. The system of claim 17 , wherein the instructions further comprise instructions that when executed cause the processing element of the data analytics computer system to: store the extracted features in a database. 23. The system of claim 22 , wherein the instructions that when executed cause the processing element of the data analytics computer system to train the classifier model comprise instructions that when executed cause the processing element of the data analytics computer system to: store information about whether the user considered the email as graymail in the database; and perform machine learning in the classifier model using the stored extracted features and stored information about whether the user considered the email as graymail.