smtplib.SMTP.sendmail: mta status codes only accessible by local variables

[sls89]

BPO	36148
Nosy	@warsaw, @bitdancer, @sls89
PRs	[3.7] bpo-36148 Implementation of instance attribute for sendmail mta status #12104
Superseder	bpo-29539: [smtplib] collect response data for all recipients

^{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 2019-02-28.21:36:34.808>
created_at = <Date 2019-02-28.18:35:43.871>
labels = ['3.8', 'type-feature', 'library', 'expert-email']
title = 'smtplib.SMTP.sendmail: mta status codes only accessible by local variables'
updated_at = <Date 2019-02-28.21:37:53.037>
user = 'https://github.com/sls89'

bugs.python.org fields:

activity = <Date 2019-02-28.21:37:53.037>
actor = 'r.david.murray'
assignee = 'none'
closed = True
closed_date = <Date 2019-02-28.21:36:34.808>
closer = 'r.david.murray'
components = ['Library (Lib)', 'email']
creation = <Date 2019-02-28.18:35:43.871>
creator = 'sls'
dependencies = []
files = []
hgrepos = []
issue_num = 36148
keywords = ['patch']
message_count = 3.0
messages = ['336864', '336871', '336872']
nosy_count = 3.0
nosy_names = ['barry', 'r.david.murray', 'sls']
pr_nums = ['12104']
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '29539'
type = 'enhancement'
url = 'https://bugs.python.org/issue36148'
versions = ['Python 3.8']

[sls89]

MTA status codes (visible via setdebuglevel(1)) are not accessible as the sendmail-method stores them only locally (code, resp).

I suggest to store the mta status codes, for instance: "250, b'2.0.0 Ok: queued as XYZ" etc. in an instance attribute (tuple) to access them on smtp-sessions.

As an email developer those information are very important to me.

[bitdancer]

Thanks for the PR, but this is a duplicate of bpo-29539, which I think has a better API proposal. Since the original author never actually submitted a PR there, perhaps you could pick up his work (after pinging the issue).

[bitdancer]

Sorry, that should be bpo-29539.