Experimental terminal mail client aiming for configurability and extensibility with sane defaults.
+3
Free Thunderbird Alternatives
The best free alternative to Thunderbird is Betterbird, which is also Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Thunderbird and loads of them are free so hopefully you can find a suitable replacement. Other interesting free alternatives to Thunderbird are K-9 Mail, Evolution, SeaMonkey and FairEmail.
filter to find the best alternatives
Most Thunderbird alternatives are Email Clients, but you can also narrow the list to Calendar Apps or Contact Managers. Other popular filters are Linux, iPhone, Open Source, Android and EU. You can also filter for EU-based alternatives if you prefer software from the European Union.
Alternatives list
yMail2 is a standalone email client for Windows (and Linux), available for free since 2003. Now with SSL support included so you can use it with Gmail and Hotmail POP3 and SMTP accounts.
Australia
122 Iceape-UXP alternativesHistorically, Iceape was a re-branding of SeaMonkey by the Debian project. However, Debian discontinued Iceape in December 2013 citing security concerns and lack of a maintainer.
Hylki is a fast, GNOME-native email client with a three-pane layout, unified inbox, and support for OAuth accounts. Fast to open, effortless to read, and private by default.
United States
An open-source email app for Android delivering privacy with a user-friendly minimalist design. It supports multiple accounts, a unified inbox, conversation view, and encryption. Offers two-way sync, offline storage, minimal data use, and battery efficiency. Export settings for easy setup.
Metis Suite is an open-source mail, calendar and drive client. It connects to the accounts you already have (Gmail, Microsoft 365/Outlook, Zoho, IMAP/SMTP, CalDAV, S3, WebDAV, FTP and SFTP) and puts them in one app, with an AI assistant, automations and phishing warnings on top.
India
+2
Email client and email notifier in one. Allows you to send, receive, and manage e-mails, get notifications of incoming email messages from your buddies, coworkers or family members online. Contains free email sender interface ready to cooperate with other software via XML, CSV...
Slovakia
EU
+5
Desktop IMAP client for macOS, Windows and Linux that reads and replies to email, then archives messages as .eml files in Maildir-style folders. Archived mail remains searchable offline, and Archive & Delete verifies the saved copy before removing it from the server.
+8
6 Doar alternativesSimple, fast and free email client for Windows in the spirit of the old Outlook Express – no ads, no tracking, your mail stays on your computer.
- Slovakia
- EU
Open-source email for growing teams. Deploy on your own infrastructure, connect your domain, and manage your organization’s email without a software subscription for every employee.
- India
A privacy-first, offline-first email client that puts you back in control. No ads, no tracking, no compromises.
- United States
Lightweight Windows taskbar app that shows unread email counts from all your Gmail and Microsoft 365 accounts, no browser or Outlook required.
Cost / License
- Freemium
- Proprietary
Since
- Since 2026
- Australia
Brazil
