Maintained by: @hkdb
Windows has Outlook
Mac has Mail
Linux has.....
- Thunderbird - Clunky and too much legacy structure
- Geary - Crippled by Gnome Online Accounts and search is unreliable
- Mailspring - Electron...
- Evolution - ... 1999
All are not necessarily always light on resource consumption...
A standalone lightweight e-mail client inspired by Geary focused on achieving the following goals:
- Resource Efficiency - Minimal CPU, RAM, and battery consumption
- Modern UX - Clean, intuitive interface with dark mode support
- Keyboard & Mouse Friendly - Full keyboard navigation with vim-style shortcuts
- Independence - No dependency on Gnome Online Accounts or other system services
- Search That Works - Basic search that actually finds your emails
Aerion is CASA Tier 2 Certified by Google's preferred authorized assessor: TAC Security
Although Linux is a first-class citizen here, it also works on:
- MacOS
- Windows
- Multiple Accounts
- Providers: (🧪 = NOT YET TESTED)
- Generic IMAP/SMTP
- GMail
- Microsoft 365 / Outlook
- Yahoo 🧪
- Proton Mail (via Proton Bridge)
- iCloud Mail
- Fastmail 🧪
- Zoho Mail 🧪
- AOL Mail 🧪
- GMX Mail
- Mail.com 🧪
- Unified Inbox (Color Code Accounts)
- Conversation Threads
- Basic Removal of Tracking Elements in Mail Content
- WYSIWYG Detachable Composer (TipTap Editor)
- WYSIWYG Signatures (TipTap Editor)
- CardDav/Google/Microsoft Contact Sync for auto-complete
- Basic Local and IMAP Search
- Notification that brings focus to the e-mail when clicked
- Auto-Sync when system wakes from suspend
- Multiple color themes (More to come...)
- PGP & S/MIME support
- Keyboard Shortcuts
This application was built with Wails + Svelte.
Transparency Disclaimer: This project leaveraged Claude models heavily to implement.
- 2026-03-11 ~ Microsoft Verified
- 2026-04-16 ~ CASA Tier 2 Certified
- 2025-04-25 ~ Google Verified
Confirmed future features:
- Extension/Plugin system with the following shipped disabled:
- Calendar
- Contacts
- Post quantum ready encryption
- Add Mailfence and Startmail templates in add account flow for easier setup
Potential features in the future:
- Customizable shortcut keys
- Advance Search
- AI Assisted Composition (Ollama)
3DF is sponsoring by way of dedicating its cloud infrastructure resources and the team's time to work on this. There's otherwise currently no sponsorship. If you like this project, please feel free to give us a star or buy us a coffee:
Google verification requires apps like Aerion to recertify for CASA Tier 2 every year which cost US$540 this year. This cost was sponsored one time by 3DF. Starting next year, we will have to depend on community or corporate sponsorship. If you want your "Buy Me a Coffee" donation to go specifically and only towards the annual CASA Tier 2 certification, in the "Say something nice..." field of the Buy Me A Coffee donation page, put, "For CASA" as the first line. You can leave the rest of the field empty or put whatever message you want to send us in the lines after.
Aerion is largely driven by community feedback. Big thanks to the following non-exhaustive list of contributors who submitted issues which led to meaningful improvements we all now enjoy. This project would not be the same without them!
*Last Updated: 2026-04-29 | Generated by gitrix