Aerion is a modern, lightweight email client inspired by Geary, focused on resource efficiency and a clean user experience.
Features:
- Multiple email accounts with unified inbox
- Support for Gmail, Outlook, and generic IMAP/SMTP
- Conversation threading
- Rich text WYSIWYG composer with TipTap editor
- Contact sync (CardDAV, Google, Microsoft) for auto-completion
- Dark mode and multiple color themes
- Keyboard-friendly navigation with vim-style shortcuts
- Detachable composer window
- Basic tracking element removal from emails
- PGP and S/MIME support
- Contacts extension (ALPHA)
- Calendar extension (ALPHA)
- Custom OAuth support for generic IMAP, SMTP, CardDAV, and CalDAV
Screenshots
Observed history
| App | Change | Version | When ↓ |
|---|---|---|---|
| updated | 0.3.5 | 21 Sept 2026 |
Upstream releases
Release notes supplied by the developer. These dates are not Flathub package publication times.
0.3.521 Sept 2026
- Temp fix for launch crash caused by WebKitGTK 2.54.0 in latest runtime - #431
- Bumped wails to 2.16.0
- Bumped golang.org/x/image v0.41.0
- Bumped golang.org/x/net v0.56.0
- Bumped golang.org/x/sys v0.46.0
- Bumped golang.org/x/text v0.39.0
0.3.418 Sept 2026
- Added default CC
- Added default BCC - #341
- Added default reply-to - #404
- Added merge identical messages in thread - #222
- Relabeled spellcheck dictionary English to English (US)
- Added spellcheck dictionary: English (UK) - #417
- Added spellcheck dictionary: Dutch
- Added dot and glow dot optional accents for unread messages
- Added window size persistence - #217
- Added mini calendar for easier navigation - #368
- Added Empty Spam button for spam folder - #239
- New app icon with full hicolor size set and scalable SVG - #395 - #99
- Fixed post delete ghost messages on message list
- Fixed thread sender and preview in message list - #169
- Fixed comma display name - #398
- Fixed composer draft format detection - #420
- Block save all attachments if flatpak - #384
- Calendar color render adjustments to alleviate #406
- Fixed Microsoft calendar attachments handling - #370
- Fixed Contacts pagination - #278
- Fixed M365 contacts - sync all folders - #278
- Fixed M365 calendar - kill the silent-zero paths - #278
- Fixed draft edit logic - #392
0.3.36 Aug 2026
- Message list redesign - #70 - #340
- Added swipe gestures - right select and left delete - #68
- Added manual config of IMAP/SMTP auth mech
- Added digest auth for contacts and calendars - #313
- Added Polish translation - PR #374
- Fixed IMAP/SMTP auto auth mech - #355
- Fixed glitch when rapid deleting messages
- Refactored to engine-level serialization
- Improved toast notification logic - #115
- Added states to fix unwanted message list reset - #348
- Improved CalDAV discovery - #363
- Basic CarDAV (Mailfence) support - #366
- Fixed typo in autostart code - #33
- Updated nb translations - PR #371
- Added g, G, alt+g, alt+G, alt+c, alt+m shortcuts - #351
- Backfilled v to contact list
- Fixed .desktop - #356 - #367
- Fixed attachment leak on reply - #381
0.3.216 Jul 2026
- Added Spellcheck for languages using Latin alphabet - #277
- Improved profile pic support - #183 - Requires force resync of contacts
- Added re-auth button to contact write
- Improved unread count and IDLE sync - #327
- True fix for duplicate e-mail add error - #318
- Fixed calendar auth on add - #337
- Added guard against wails bridge saturation dervied from calendar rapid view switch
- Fixed CarDAV sync profile pic bug - May require force resync of contacts
- Fixed toast cutoff in mobile layout - #339
- Updated i18n translation