<!-- SPDX-License-Identifier: MIT -->
<!-- SPDX-FileCopyrightText: 2025-2026 Marcus Quinn -->

# t1519: S/MIME certificate setup helper

## Origin

- **Created:** 2026-03-16
- **Session:** opencode:email-system-planning
- **Created by:** human + ai-interactive
- **Parent task:** none (Phase 4 polish)

## What

Create guidance and helper for S/MIME certificate acquisition, installation per provider/client (Apple Mail, Thunderbird, Outlook). Covers certificate authorities, installation steps, and verification.

## Acceptance Criteria

- [ ] S/MIME setup guidance doc exists
- [ ] Per-client installation steps documented

## Dependencies

- **Blocked by:** t1498 (security doc references S/MIME)

## Estimate Breakdown

| Phase | Time | Notes |
|-------|------|-------|
| Implementation | 2h | Research + guidance doc |
| **Total** | **2h** | |
