Release
Thu, Jun 4, 2026
3 min read
Delta Chat Desktop 2.51.0
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At a glance
Delta Chat Desktop 2.51.0 stabilizes calls and channels, enables post-quantum cryptography forward compatibility, and adds encryption enforcement option
Original release notes
Removed
Remove "Move to DeltaChat folder", in case you are using the option, a device message shows how to proceed
Remove "Only fetch from DeltaChat folder" option, the functionality is preserved for existing profiles
Remove "Delete Messages from Server" option, this is now up to the server: Chatmail handles that automatically, classic email servers used as relay often have lots of storage or options themselves
Remove "Show Email" options, all messages are shown by default, account sharing is anyway not supported
Added
"Mark as Unread" menu item (and "as Read")
Add inline reply on notifications (Win, Mac)
Allow to submit "Edit Group" with "Enter"
Calls & channels are not experimental anymore (#6335 )
Add window menu for MacOS (#6357 )
Improve crash handling (#6341 )
Click on call messages opens/focus call window (#6376 )
WebXDC: add isAppSender, isBroadcast
Add option to force encryption (#6410 )
Show imap folder if set (#6424 )
Resend the last 10 messages to new broadcast channel member
Enable PQC (Post-Quantum Cryptography) support. We do not generate PQC keys yet, this step is needed for forward compatibility
Allow otherwise invalid TLS connections if the key is unchanged
Do not show "non delivered" notifications in broadcast channels
Adapt quota warning to automatic cleanup.
Improved avatar resolution
Fixed
Use correct filename when dragging a file out (#6219 )
Chat list switching between archive by itself (#6255 )
Chat list: Ctrl + Space multiselect on Linux
Add counter for screenreaders (#6297 )
Show channel description (#6283 )
Enable sticker replies (#6278 )
Detect images dropped with uppercase extensions (e.g. .JPG) (#6324 )
Switch account in all SelectChat dialogs (#6279 )
Mark visible messages as read after a programmatic scroll completes (#6329 )
Show appropriate buttons when invite code is pasted to search field (#6330 )
Hide apps for channels (#6336 )
Create group/channel with description & image (#6314 )
Resize reactions after image load (#6334 )
Truncate author name in quotes (#6356 )
Always show sent time in html email view(#6363 )
Show rtl text in correct direction in mixed texts (#6379 )
Qr code video is flipped for back camera (#6373 )
Set default height smaller then screen height (#6385 )
Adapt accountlist sidebar (#6380 )
Reload settings after importing backup (#6396 )
Miscellaneous Tasks
Update translations (#6295 )
Upgrade Electron to 41.7.1
Add burmese language (#6416 )
Upgrade core to 2.51.0 (#6425 )
Upgrade React zoom pan pinch (#6375 )
Replace emoji mart (#6201 )
Other
HTML viewer: move Load Remote Images
Sticker folder rewrite (#6231 )
change: remove open sticker folder button
fix: keep sticker picker open where appropriate
Add Device: move buttons to menu (#6126 )
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