mailbox fails to read message from mbox

[peterwurmsdobler]

BPO	45882

^{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 2021-11-23.18:18:02.343>
labels = ['3.8', 'type-bug', 'library']
title = 'mailbox fails to read message from mbox'
updated_at = <Date 2021-11-23.18:18:02.343>
user = 'https://bugs.python.org/peterwurmsdobler'

bugs.python.org fields:

activity = <Date 2021-11-23.18:18:02.343>
actor = 'peter.wurmsdobler'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2021-11-23.18:18:02.343>
creator = 'peter.wurmsdobler'
dependencies = []
files = []
hgrepos = []
issue_num = 45882
keywords = []
message_count = 1.0
messages = ['406873']
nosy_count = 1.0
nosy_names = ['peter.wurmsdobler']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue45882'
versions = ['Python 3.8']

[peterwurmsdobler]

When using mailbox to convert mbox files to maildir, I have noticed that it cannot handle messages in the mbox file that start with two subsequent From lines in the header like:

From - Fri Feb 20 09:46:18 1998
>From namel@company.com Wed Feb 18 18:38:38 1998

A new maildir message will be created, but none of fields following the two header lines such as Date etc. will be parsed; the result is a message with header and body inside the message.

[fsc-eriker]

That is not really a valid mbox file in the first place.