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85 lines
2.6 KiB
Plaintext
85 lines
2.6 KiB
Plaintext
---
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id: smime
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title: S/MIME Email Security
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description: Secure/Multipurpose Internet Mail Extensions (S/MIME) allows you to sign (prove identity) and encrypt (protect content) email messages.
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---
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import { Steps, Callout, Tabs } from 'nextra/components'
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import { Mail, BadgeAlert, ShieldCheck } from 'lucide-react'
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# S/MIME Email Security
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Secure/Multipurpose Internet Mail Extensions (S/MIME) allows you to **sign** (prove identity) and **encrypt** (protect content) email messages.
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<Callout type="warning" emoji={<BadgeAlert className="w-5 h-5" />}>
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**Internal Use Only:**
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TrustLab certificates are private. If you send signed emails to **External Recipients** (e.g., Gmail, Yahoo), they will see an "Untrusted/Invalid Signature" warning because they do not trust the TrustLab Root CA.
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**Use this for internal corporate communication only.**
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</Callout>
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## Setup Guide
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## Configure Microsoft Outlook
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<Tabs items={['Classic Outlook (Desktop)', 'New Outlook (Web Style)']}>
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<Tabs.Tab>
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**Supported Versions:** Outlook 365, 2019, 2016.
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<Steps>
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### 1. Open Trust Center
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Go to **File > Options > Trust Center > Trust Center Settings**.
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### 2. Email Security
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Select **Email Security** from the left sidebar.
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### 3. Import Certificate
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Under *Encrypted Email*, click **Settings...**
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* **Signing Certificate**: Click 'Choose' and select your TrustLab cert.
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* **Encryption Certificate**: Same as above.
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### 4. Save
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Click **OK** to apply.
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</Steps>
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</Tabs.Tab>
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<Tabs.Tab>
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**Supported Versions:** New Outlook for Windows, OWA.
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*Note: Requires S/MIME Control extension.*
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<Steps>
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### 1. Open Settings
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Click the **Gear Icon** (Settings) in the top right.
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### 2. S/MIME Menu
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Navigate to **Mail > S/MIME**.
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### 3. Enable
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Enable **"Encrypt with S/MIME"** and select your certificate.
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</Steps>
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</Tabs.Tab>
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</Tabs>
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## Configure Thunderbird
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**Version Requirement:** v115+ (Supernova) or newer.
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<Steps>
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### 1. Account Settings
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Click the **Menu (≡)** button and select **Account Settings**.
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### 2. End-to-End Encryption
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Select your email account from the sidebar and click **End-to-End Encryption**.
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### 3. Import Certificate
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In the **S/MIME** section, click **Add** (or Manager) to import your `.p12` file.
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### 4. Apply Certificate
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Under *Select Certificate*, choose the imported file for both:
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* **Digital Signing**
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* **Encryption**
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</Steps>
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## How to Test
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Send an email to a colleague who also has the Root CA installed. They should see a verified **Ribbon/Badge** icon indicating the email is trusted and unmodified.
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