1. Aufreiter, N., Boudet, J., Weng, V.: Why marketers should keep sending you e-mails. McKinsey & Company (2014)
2. Fallows, D.: Email at Work. Pew Internet & American Life Project (2002)
3. Dada, E.G., Bassi, J.S., Chiroma, H., Adetunmbi, A.O., Ajibuwa, O.E.: Machine learning for email spam filtering: review, approaches and open research problems. Heliyon 5(6), e01802 (2019)
4. Mansoor, R.A.Z.A., Jayasinghe, N.D., Muslam, M.M.A.: A comprehensive review on email spam classification using machine learning algorithms. In: 2021 International Conference on Information Networking (ICOIN), pp. 327–332. IEEE (2021)
5. Thirumoorthy, K., Muneeswaran, K.: Feature selection for text classification using machine learning approaches. Natl. Acad. Sci. Lett. 45, 51–56 (2021). https://doi.org/10.1007/s40009-021-01043-0