There are over 6.32 billion email accounts accounts. This figure is predicted to reach 7.71 billion by 2021 which is a growth of more than 22% - Radicati Group (2017)
There are 3.7 billion email users worldwide who send and receive about 269 billion emails per day. - Radicatti Group (2017)
3,104,450,712 legitimate emails are sent every hour. - Internetlivestats (2018)
The number of email users is still growing. 72% of EU individuals aged 16 to 78 use internet to send / receive emails in 2017. Compare this to only 48% in 2007. – Eurostat “Individuals using the internet for sending/receiving e-mails” (2018)
https://www.emailisnotdead.com/