使用Python实现Office 365邮件自动化遇多种错误求助

我尝试了三种Python实现Office 365邮件自动化的方案，均出现不同错误。公司使用企业版Office 365账号，这可能是问题诱因之一。以下是具体方案及对应错误：

方案1：使用smtplib发送邮件 #

def send_email():
    try:
        # Create message container - the correct MIME type is multipart/alternative.
        msg = MIMEMultipart('alternative')

        msg['From'] = mail_from
        msg['To'] = mail_to
        msg['Subject'] = mail_subject

        # see the code below to use template as body
        body_text = mail_body_text
        body_html = mail_body_html

        # Create the body of the message (a plain-text and an HTML version).
        # Record the MIME types of both parts - text/plain and text/html.
        part1 = MIMEText(body_text, 'plain')
        part2 = MIMEText(body_html, 'html')

        # Attach parts into message container.
        # According to RFC 2046, the last part of a multipart message, in this case
        # the HTML message, is best and preferred.
        msg.attach(part1)
        msg.attach(part2)

        # Send the message via local SMTP server.
        mail = smtplib.SMTP("smtp.outlook.office365.com", 587, timeout=20)

        # if tls = True
        mail.starttls()

        recepient = [mail_to]

        mail.login(username, __password)
        mail.sendmail(mail_from, recepient, msg.as_string())
        mail.quit()

    except Exception as e:
        raise e

错误信息：

smtplib.SMTPAuthenticationError: (535, b'5.7.139 Authentication unsuccessful, the user credentials were incorrect. [MN2PR11CA0027.namprd11.prod.outlook.com]')

方案2：使用O365库 #

def maybe_this():
    credentials = (username, __password)
    account = Account(credentials)  #Account object from O365.Account.
    m = account.new_message()
    m.to.add(mail_to)
    m.subject = mail_subject
    m.body = mail_body_html
    m.send()

错误信息：

RuntimeError: No auth token found. Authentication Flow needed

方案3：针对方案2错误调整后的代码 #

def maybe_that():
    # SPOILER ALERT: It doesn't frigging work.
    credentials = (username, __password)
    my_auth_flow_type = 'public'
    my_token_path = '(path to my python package)'
    my_token_backend = 'my_token.txt'
    account = Account(credentials, auth_flow_type=my_auth_flow_type, token_path=my_token_path, token_backend=my_token_backend)
    m = account.new_message()
    m.to.add(mail_to)
    m.subject = mail_subject
    m.body = mail_body_html
    m.send()

错误信息：

ValueError: Provide client id only for public flow credentials

恳请协助排查问题，谢谢！

内容的提问来源于stack exchange，提问作者Guitar Geek