TypeError: b2a_base64() argument 1 must be bytes or buffer, not str during SMTP.login

[milivojm]

BPO	6291
Nosy	@bitdancer
Superseder	bpo-5259: smtplib is broken in Python3
Files	test.py: Python example script invoking error

^{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 = <Date 2009-06-16.12:59:24.675>
created_at = <Date 2009-06-16.08:19:53.487>
labels = ['type-bug', 'library']
title = 'TypeError: b2a_base64() argument 1 must be bytes or buffer, not str during SMTP.login'
updated_at = <Date 2009-06-16.12:59:24.646>
user = 'https://bugs.python.org/milivojm'

bugs.python.org fields:

activity = <Date 2009-06-16.12:59:24.646>
actor = 'r.david.murray'
assignee = 'none'
closed = True
closed_date = <Date 2009-06-16.12:59:24.675>
closer = 'r.david.murray'
components = ['Library (Lib)']
creation = <Date 2009-06-16.08:19:53.487>
creator = 'milivojm'
dependencies = []
files = ['14307']
hgrepos = []
issue_num = 6291
keywords = []
message_count = 2.0
messages = ['89428', '89431']
nosy_count = 2.0
nosy_names = ['r.david.murray', 'milivojm']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '5259'
type = 'behavior'
url = 'https://bugs.python.org/issue6291'
versions = ['Python 3.0']

[milivojm]

When trying to send an e-mail using a tutorial like example, I get the
following message:

Traceback (most recent call last):
  File "test.py", line 3, in <module>
    server.login("domena\someuser","somepassword")
  File "C:\Python\lib\smtplib.py", line 583, in login
    "%s %s" % (AUTH_LOGIN, encode_base64(user)))
  File "C:\Python\lib\email\base64mime.py", line 96, in body_encode
    enc = b2a_base64(s[i:i + max_unencoded]).decode("ascii")
TypeError: b2a_base64() argument 1 must be bytes or buffer, not str

[bitdancer]

This is a duplicate of bpo-5259, and has already been fixed. Thanks
for the report.