AI features
mail uses the OpenAI Responses API for optional, bounded assistance. OpenAI is disabled until an API key is configured. The selected model is shared by every AI operation.
Available actions
| Feature | Behavior | Data sent to OpenAI |
|---|---|---|
| Compose assistance | Improve a draft or rewrite it to be concise, formal, or friendly. | Recipients, subject, and current draft content. |
| Reply draft | Generate a proposed reply from an opened message or thread. | Relevant message text and addressing context. |
| Message and thread summary | Summarize one thread or a recent mailbox window. | Subject, sender, recipients, previews, and bounded body text. |
| Action extraction | Find explicit tasks, owners, dates, and priorities in a thread. | Bounded text from each thread message. |
| Translation | Translate an opened message into the preferred language. | Message content and target language. |
| Attachment summary | Summarize supported text-like attachments and cache the result. | Extracted attachment text. |
| Importance classification | Mark incoming messages likely to need attention. | Incoming message metadata and bounded content. |
The application requests store: false, limits input and output sizes, and treats email content as untrusted input. These controls do not replace reviewing the OpenAI account's own retention and data processing terms.
Automatic classification
Importance classification is the only automatic AI feature. When enabled, the worker processes newly synchronized messages in the background. Disable it to retain all on-demand AI actions without automatically sending incoming mail content to OpenAI.
Configuration
| Item | Setting name | Environment variable | Requirement |
|---|---|---|---|
| All AI actions | Settings > AI Features > OpenAI API key | OPENAI_API_KEY | Required. A saved key takes precedence over the environment. |
| Model | Settings > AI Features > Model | OPENAI_MODEL | Optional; defaults to gpt-4.1-mini. |
| Automatic importance | Settings > AI Features > Classify important incoming mail | OPENAI_IMPORTANCE_CLASSIFICATION | Optional; defaults to enabled when an API key exists. Set the environment value to false to disable it. |
| Translation language | Settings > AI Features > Mail translation target language | None | Optional; defaults to Korean. |
| Stored API key encryption | None | MAIL_SECRET_KEY | Required to encrypt an API key saved through Settings. |
Automatic classification requires the worker. On-demand actions run through authenticated web requests. Demo mode returns sample AI results without calling OpenAI.