Mail gets confused by emails with identical Message-Id
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- Dominant language
- JavaScript
- Stars
- 1k
- Forks
- 348
- Avg merge
- 12h 28m
- Merged PRs (30d)
- 91
Description
Steps to reproduce
Send an email that you receive in two ways (e.g. two mailing lists).
Expected behavior
Mail should show both emails independently.
Actual behavior
Mail shows the emails in the same thread view, as if they were referring to each other.
If I delete one of them, the other vanishes, too. It only reappears after a page reload.
If the emails don't have an identical subject (e.g. from an added prefix from a mailing list), Mail shows one subject in the messages list, and the other in the thread view as headline (see screenshot).
Mail app version
4.2.0 rcX
Nextcloud version
31 rcX
Mailserver or service
No response
Operating system
No response
PHP engine version
None
Nextcloud memory caching
No response
Web server
None
Database
None
Additional info
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
Reproduce the issue by delivering the same email through two mailing lists, including cases with identical and different subjects. Trace how Mail groups messages into a thread and how deletion updates the message list; done means both copies remain independent, deleting one leaves the other visible, and subject display is consistent without requiring a reload.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript
- Domain
- frontend
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100