thunderbird / thunderbird/thunderbird-android
“Unable to send message” - WHY?
Nobody has claimed this yet.
- Dominant language
- Kotlin
- Stars
- 14k
- Forks
- 2.8k
- Avg merge
- 3d 3h
- Merged PRs (30d)
- 57
Description
Checklist
- I have used the search function to see if someone else has already submitted the same bug report.
- I will describe the problem with as much detail as possible.
App
K-9 Mail
App version
18
Where did you get the app from?
F-Droid
Android version
16
Device model
No response
Steps to reproduce
When I compose a message it ends in Outbox. When I tell K9 to send the message, K9 notifies “Unable to send message”.
Expected behavior
K9 should be more precise about the problem:
- the server cannot be reached (is offline) - TCP problem
- server does not accept credentials
- server temporary rejects SMTP verbs (which verb?)
Actual behavior
The message “Unable to send message” appears as notification, without details.
Logs
No response
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Begin with the compose/send flow and Outbox behavior described here; reproduce it on Android 16 with K-9 Mail 18 and capture the underlying failure details. Trace where each send failure becomes the “Unable to send message” notification, then verify that offline, credential, and SMTP rejection cases identify the relevant cause.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- android, kotlin
- Domain
- mobile
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Active
- Clarity
- Mostly clear
- Newbie friendliness
- 48/100