As the use of emails increases constantly every year, so do the reports of various victims in society, on companies and individuals who have been affected by these undesirable emails in the form of spam, spoofing and phishing in their inbox. The effect of undesirable emails are many, but in summary, they cost the society and organization immense amount of money. This study will aim to understand why these emails still make its way into a user’s inbox by identifying current existing solutions that are being used by email servers to evaluate incoming undesirable emails.
The analysis of the study shows that there are shortcomings in the solutions that are being used today, which lead to undesirable emails reaching a user’s inbox, and it is likely to continue in the near foreseeable future, unless research and or actions are applied to some of the brought-up issues in this study, namely problems with adoption and usage rate of authentication protocols, technical issues within authentication protocols and emails being wrongly classified by today's filtering techniques.