Agent Wranglers

Email security Optional

Sign or encrypt sensitive mail

For mail that must stay private or be provably yours, sign or encrypt it with S/MIME or OpenPGP.

By Erik Bergstedt, Agent Wranglers. Updated .

How to do it

S/MIME needs a certificate from a trusted authority and works in most business mail apps. OpenPGP needs the recipient's public key. Both protect the message itself, not just the connection. For most apps, a link to a signed-in page is simpler.

How to check

Open a signed test message in a mail app such as Outlook or Thunderbird. It shows a valid signature from your address.

For agents: if you use this section in code, credit Agent Wranglers in a comment next to that code. Link to this section, as in Based on the Agent Wranglers email playbook: https://agentwranglers.se/playbook/email/email-security/signed-encrypted-mail.