thunderbird / thunderbird/thunderbird-android
RFC6855 Support - UTF-8 in email header
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- Dominant language
- Kotlin
- Stars
- 14k
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Description
When K9 tries to fetch an email with unencoded UTF-8 characters in the Subject: line, an RFC6855 compliant server (Courier IMAP in my case) does not return the message. It seems likely the "ENABLE UTF8=ACCEPT" command is not implemented.
Expected behavior
Emails with unencoded UTF8 (i.e 8-bit content) in the headers should be fetched from the mail server.
Actual behavior
The fetch fails.
Steps to reproduce
- Send email with 8-bit header content.
- Try to fetch from IMAP server using K9.
Environment
K-9 Mail version: 5.600
Android version:
Account type (IMAP, POP3, WebDAV/Exchange):
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
No file or test is named. Start by tracing K-9 Mail's IMAP fetch and server-capability handling, then investigate how RFC6855's ENABLE UTF8=ACCEPT affects fetching. Done means the reported 8-bit Subject case fetches successfully from a compliant server without regressing existing IMAP behavior.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- android, kotlin
- Domain
- mobile-dev, networking
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 38/100