Why It Matters
Standard email travels in plain text. Without encryption, anyone who intercepts the message — whether it's a hacker on public Wi-Fi or a compromised server along the route — can read everything. For businesses sending invoices, contracts, or customer data, that's a serious liability. Many compliance frameworks (HIPAA, SOC 2, GDPR) either require or strongly recommend email encryption.
How It Works
TLS (Transport Layer Security) encrypts the connection between mail servers, protecting emails while they move from point A to point B. Most major providers support it, but it's opportunistic — if the receiving server doesn't support TLS, the email falls back to plain text. End-to-end encryption (using S/MIME or PGP) goes further: the message is encrypted on your device and only decrypted on the recipient's device. Nobody in between, not even the email provider, can read it.
Quick Tips
- Enable TLS on your mail server at minimum — it protects against casual interception and most providers support it
- Use end-to-end encryption for sensitive communications like legal documents, financial data, or healthcare information
- Check if your recipients can actually handle encrypted email before sending — S/MIME requires certificate exchange beforehand