By Roman Daneghyan Global email users are estimated to reach around 4.6 billion in 2025, and digital marketers are reveling in that news. Email marketing continues to be one of the highest ROI [return on investment] communication channels in 2021, and that fact does not seem to change in the near future. In parallel to the promotion opportunities that email marketing gives to digital marketers, many challenges arise regarding security. According to estimations, around 91 percent of cyberattacks start with phishing emails. This, in turn, is increasing the necessity to install a robust security system against cyberattacks. Below you can find the main threats that email marketers are likely to face in 2021 and how they can fight against them. Phishing-Based Attacks Phishing emails and web attacks are not new, but they have recorded unprecedented rates in 2021. Statistics show that there were 27 percent more phishing sites (more than …