UnicodeEncodeError raise from smtplib.verify() method

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2019-02-23.07:59:18.247>
labels = ['3.8', 'type-bug', '3.7', 'expert-unicode']
title = 'UnicodeEncodeError raise from smtplib.verify() method'
updated_at = <Date 2020-03-27.11:16:23.501>
user = 'https://github.com/Windsooon'

bugs.python.org fields:

activity = <Date 2020-03-27.11:16:23.501>
actor = 'vstinner'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Unicode']
creation = <Date 2019-02-23.07:59:18.247>
creator = 'Windson Yang'
dependencies = []
files = []
hgrepos = []
issue_num = 36093
keywords = []
message_count = 4.0
messages = ['336374', '336375', '336509', '365140']
nosy_count = 3.0
nosy_names = ['barry', 'ezio.melotti', 'Windson Yang']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue36093'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']