如供第三方使用，可在邮箱设置中，申请获取授权码，然后用授权码替换邮件中邮箱密码password。

import re
from email.mime.text import MIMEText
from email.header import Header
import smtplib
MailAddress = {
    "username": "***@163.com",
    "password": "ojamrqshpltzbahe"
}

class Email(object):
    def __init__(self, to_addr, message):
        super().__init__()
        self.from_addr = MailAddress["username"]
        self.password = MailAddress["password"]
        self.to_addr = to_addr
        self.message = message

    def send(self):

        msg = MIMEText(self.message, 'plain', 'utf-8')

        msg['Subject'] = Header('程序监控信息', 'utf-8')
        msg['From'] = 'Zhang<%s>' % self.from_addr
        msg['To'] = self.to_addr

        if re.search("163.com", self.from_addr):
            smtp_server = 'smtp.163.com'
        elif re.search("qq.com", self.from_addr):
            smtp_server = 'smtp.qq.com'

        try:
            server = smtplib.SMTP_SSL(smtp_server, 465)  # 这里使用ssl，端口为465 / 994
            # print('开始登录')
            server.login(self.from_addr, self.password)  # 登录邮箱
            # print('登录成功')
            server.sendmail(self.from_addr, self.to_addr, msg.as_string())  # 将msg转化成string发出
            server.quit()
            # print("邮件发送成功")
        except smtplib.SMTPException as e:
            print("邮件发送失败", e)

# 调用方法:
Email('***@163.com', 'ok_message').send()