Triage board
Messages become actionable piles: needs reply, waiting, FYI, and done. Rules and optional AI help, but you stay in control.
Private beta for Windows and Linux
Email that finally feels finished.
Mailer is a local-first desktop email client. It connects to your existing mailbox over IMAP/SMTP, turns incoming messages into a board of things to finish, and keeps your mail on your own device.
Windows & Linux
IMAP / SMTP
Gmail & Microsoft OAuth
Local SQLite
No telemetry
Built for the inbox you actually have
Mailer is a full mail client, not a web wrapper: multiple accounts, folders, drafts, attachments, search, PGP, calendar, and background sync over IMAP IDLE.
Real mail workflow
Multi-account IMAP, IDLE push, folders, multi-select, drag & drop, drafts, attachments, mailto: and .eml.
Composer
HTML mail with colours and alignment, per-identity signatures, Cc/Bcc, reply, forward, and a local outbox with undo.
Privacy strip
Remote images and tracking links are blocked by default. Load them only when you choose, and unsubscribe without leaving the reader.
Search and cleanup
Fast local full-text search, sender profiles, subject rules, bulk tidy views, and a timeline across all accounts.
Security
OpenPGP sign/encrypt, S/MIME certificates, and an OS-bound secrets vault for passwords and OAuth tokens.
Calendar
ICS invitations, a simple agenda, and event proposals from incoming mail.
Optional AI
Drafts, translation, and triage with the provider you configure — OpenAI, Anthropic, Gemini, Mistral, local models, and more.
Local integrations
An optional mailer-mcp bridge lets assistants you choose work with Mailer over a local RPC connection.
Local-first by design
Mailer does not run a mail server or a cloud mailbox. Your messages are fetched from your provider and stored on your computer.
- Mail, attachments, contacts, calendar, and settings live in a local SQLite database and local blob folder.
- OAuth tokens and passwords are kept in an encrypted vault sealed by the OS keyring or DPAPI.
- No telemetry, no analytics, no advertising SDKs, and no sale of personal data.
- Remote images and tracking links are blocked until you explicitly allow them.
- AI features are optional and use only the provider you configure.
Where your data lives
On Windows, Mailer stores its data under %APPDATA%\Mailer. On Linux, it uses
$XDG_CONFIG_HOME/Mailer or ~/.config/Mailer. A portable build can
use MAILER_HOME.
You can remove an account in the app and delete the whole local data folder at any time. See the Privacy Policy for details.
Google OAuth, used only for your mail
Mailer uses Google OAuth 2.0 so you can sign in to Gmail without handing your Google password to the app. The access token is used by the app's IMAP/SMTP client.
- The Gmail scope
https://mail.google.com/is used only to read, send, and manage your email at your request. - Mailer does not use Google user data for advertising, profiling, or sale.
- Mailer does not let humans read your Google data; support only sees what you choose to send.
- You can revoke access at any time at myaccount.google.com/permissions.
Google API Services User Data Policy.
Mailer's use and transfer to any other app of information received from Google APIs will
adhere to the Google
API Services User Data Policy, including the Limited Use requirements. See the
Privacy Policy for the full disclosure.
Private beta
Mailer is currently in private beta for Windows and Linux. There is no public download yet. Write to martin@kukal.cz with a short note about your setup and we will send access instructions.