Sipher AI
SipherMail includes a full AI suite built on self-hosted infrastructure in Germany. Your email data never leaves our servers or goes to third-party AI providers.
AI features
- Sipher AI Copilot — A 4th-pane chat assistant that knows your inbox. Ask questions, summarise threads, and get drafts.
- Rewrite & Suggestions — In-editor AI for improving tone, clarity, and generating reply drafts.
- Thread Summaries — One-click AI summary of long threads and attachments.
- AI Credits — How credits work, per-plan limits, and how to top up.
Privacy model
All AI features run on SipherMail's own dedicated GPU servers (Hetzner, Falkenstein, Germany). We use open-source models. Your data is never sent to OpenAI, Anthropic, Google, or any other third-party AI provider. No data is used for model training.
Enable AI features
Go to Settings → Sipher AI and toggle on the features you want. Each feature can be enabled or disabled independently. Some features consume AI credits.