Ray Tomlinson, an MIT graduate, sent the first email over a network in October 1971. Fast forward 50 years, and around 121 trillion emails are sent yearly among 4.3 billion individuals, making email the paramount form of written communication worldwide. Google, Yahoo, and Outlook.com (formerly Hotmail) recently announced stricter email security protocols to counter spam and phishing attempts, with April 2024 marking the start of emails being blocked for non-compliance. Implementation of email authentication standards like SPF, DKIM, and DMARC are crucial, ensuring deliverability and security. Non-compliance could lead to rejection of emails, impacting businesses and users.
https://www.xomedia.io/blog/a-deep-dive-into-email-deliverability/