Anyone who runs a large email system would recognise these figures. I remember a client some years ago where less that 2% of all inbound email was actually legitimate…:
[…] On a monthly basis, the data shows that the BBC receives an average of 6,704,188 hostile e-mails classed as scam or spam. Additionally, an average of 18,662 malware attacks such as viruses, ransomware and spyware are blocked. Across the eight-month period running from January to August this year, a total of 51,898,393 infected e-mails were blocked by the BBC’s cyber defence systems.