python / python/cpython

mailbox.MMDF wrongly adds From_ header to file

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stdlib topic-email type-bug
Dominant language
Python
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Description

BPO 30428

Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2017-05-22.10:28:18.953>
labels = ['type-bug', 'library']
title = 'mailbox.MMDF wrongly adds From_ header to file'
updated_at = <Date 2017-05-22.10:28:18.953>
user = 'https://bugs.python.org/ralphcorderoy'

bugs.python.org fields:

activity = <Date 2017-05-22.10:28:18.953>
actor = 'ralph.corderoy'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2017-05-22.10:28:18.953>
creator = 'ralph.corderoy'
dependencies = []
files = []
hgrepos = []
issue_num = 30428
keywords = []
message_count = 1.0
messages = ['294138']
nosy_count = 1.0
nosy_names = ['ralph.corderoy']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue30428'
versions = ['Python 3.6']

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

Start at the mailbox.MMDF implementation and reproduce the reported file-writing behavior with a minimal case. Trace why a From_ header is added, then add a focused regression test; done means MMDF writes the file without the unwanted header.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
backend
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
30/100

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