poplib: Line too long error causes knock-on failure to retrieve all subsequent messages

[ChrisSmowton]

BPO	24706

^{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 2015-07-24.15:24:32.632>
labels = ['library']
title = 'poplib: Line too long error causes knock-on failure to retrieve all subsequent messages'
updated_at = <Date 2015-07-24.15:24:32.632>
user = 'https://bugs.python.org/ChrisSmowton'

bugs.python.org fields:

activity = <Date 2015-07-24.15:24:32.632>
actor = 'Chris Smowton'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2015-07-24.15:24:32.632>
creator = 'Chris Smowton'
dependencies = []
files = []
hgrepos = []
issue_num = 24706
keywords = []
message_count = 1.0
messages = ['247283']
nosy_count = 1.0
nosy_names = ['Chris Smowton']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue24706'
versions = ['Python 2.7']

[ChrisSmowton]

As mentioned in bpo-23906, when poplib bails from receiving a message with a 'line too long' error it neither flushes nor re-establishes the TCP connection. This means that subsequent commands fail because instead of the expected response we receive part of the unflushed data from the message that triggered the original error.