SIEVER Mail
The facts below are what the maker publishes about SIEVER Mail, checked and dated. Our editors have not written about it yet.
The facts
Each one read from SIEVER Mail's own pages, with the date it was checked.
What it does
- Accounts
- It supports multiple IMAP/SMTP and Gmail OAuth accounts alongside a unified inbox.checked 12 Oct 2026
- Attachments
- Users can open or save attachments, attach recently used files, and drag files into the composer.checked 12 Oct 2026
- Availability
- The project is released under the Apache License 2.0.checked 12 Oct 2026
- Connections
- IMAP connections use SSL/TLS or required STARTTLS, and Gmail access uses OAuth 2.0 over IMAP/SMTP rather than the Gmail HTTP API.checked 12 Oct 2026
- Development status
- The README describes the application as in active development and says its data layout may change while the 1.x baseline settles.checked 12 Oct 2026
- Email support
- It supports multiple IMAP/SMTP accounts and Gmail OAuth accounts in the same client.checked 12 Oct 2026
- Extensions
- A custom fork can attach one extension at build time, with hooks for toolbar actions, settings tabs, dialogs, IPC, and composer fonts and colors.checked 12 Oct 2026
- Intended users
- The maker describes it as originating with a small engineering team seeking a fast, focused client for multiple accounts and folders.checked 12 Oct 2026
- Layouts
- It offers side-by-side folders, message list, and reader panes, or a dense table above the reader.checked 12 Oct 2026
- Local data
- Mail data is stored in a local SQLite database, and credentials are handled through the operating system keychain using Electron safeStorage.checked 12 Oct 2026
- Mail composition
- The composer supports signatures, replies and forwards, and aims to preserve message layout across email clients.checked 12 Oct 2026
- Mail workflow
- Users can sort and group messages, filter unread or flagged mail, search by sender, recipient or subject, and act on selected messages in bulk.checked 12 Oct 2026
- Maintainer and support
- The repository says it is authored and maintained by Mattia Beltrami and welcomes issues through its GitHub tracker.checked 12 Oct 2026
- Message handling
- The client supports replies, forwards, attachments, signatures, bulk actions, keyboard navigation, and light or dark themes.checked 12 Oct 2026
- Organization
- Users can sort by date, sender, subject, or size; group messages; filter unread or flagged mail; and search with field-specific terms.checked 12 Oct 2026
- Privacy
- The project states that it has no telemetry or third-party tracking.checked 12 Oct 2026
- Product
- SIEVER Mail is an open-source desktop email client built with Electron.checked 12 Oct 2026
- Security
- The technical documentation says incoming HTML is sanitized and shown in sandboxed frames, and opened attachments do not execute.checked 12 Oct 2026
- Support
- The README directs users to the GitHub issue tracker for issues.checked 12 Oct 2026
- Unified inbox
- Its unified inbox gathers selected accounts’ inboxes and labels each message with its account.checked 12 Oct 2026
Where it runs
- App coverage
- desktopchecked 20 Sep 2026
- Platforms
- The build documentation lists macOS arm64 and x64, Windows x64, and Linux x64 and arm64 targets.checked 12 Oct 2026
Money
- License and cost
- The public project is released under the Apache License 2.0, and the opened project pages list no paid plans or trial.checked 12 Oct 2026
Alternatives to SIEVER Mail
- 1
Zoho Mail
Free planAndroidiOSWebAPI9.0Free plan - 2
Mailbutler Smart Assistant
Free planAndroidiOSWebExtension8.9Free plan - 3
Front
AndroidiOSWebAPI8.6From $25 a month - 4
Spike
Free planAndroidiOSWebmacOS8.5From $4 a month - 5
eM Client
Free planAndroidiOSmacOSWindows8.4From $39.95 a year - 6
Newton Mail
Free planAndroidiOSmacOSWindows8.4From $5 a month