thunderbird / thunderbird/thunderbird-android

After sending an email using 163 Mailbox as the sender, two identical sent emails will appear in the "Sent" folder (one is redundant).

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Dominant language
Kotlin
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Forks
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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

Thunderbird for Android

App version

20.0

Where did you get the app from?

Other

Android version

16

Device model

No response

Steps to reproduce
  1. Use 163 email as the sender to write a file
  2. Send emails
Expected behavior

In the 'Sent' folder of the sender's mailbox, a sent email is present.

Actual behavior

In the 'Sent' folder of this sender's email, two identical sent files are visible. When viewed on the 163 Mailbox official website, one of them carries a specific marker indicating the send status (success/failure), as illustrated below.
Image

Logs

No response

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Reproduce the issue in Thunderbird for Android 20.0 with a 163 Mailbox sender on Android 16, then compare the Sent folder with the 163 Mailbox website. Trace the sending and Sent-folder synchronization flow to identify why both copies appear. Done means a sent message appears only once while preserving the provider's send-status behavior.

Written by the indexing model from the issue text.

Assessment

Tech stack
android, kotlin
Domain
mobile
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Quiet
Clarity
Mostly clear
Newbie friendliness
50/100

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