Email statistics 2026 (Radicati / Statista / EmailToolTester)

Radicati Group / Statista / EmailToolTester. Email Statistics reporting for 2026. emailtooltester.com/en/blog/how-many-emails-are-sent-per-day/.

Key facts: 4.73 billion active email users worldwide. 392.5 billion messages per day in 2026.

Use: Establishes operational scale of email as a Tier 3 system. Cited in C-0013 and E-0008.

Original whitepaper reference: [18]