# !/usr/bin/python
    # -*- coding: UTF-8 -*-

    import smtplib
    from email.mime.text import MIMEText
    from email.header import Header

    # 第三方 SMTP 服务
    mail_host = ""  # 设置服务器
    mail_user = "xxx@"  # 用户名
    mail_pass = "xxx"  # 口令

    sender = mail_user
    sender_name = "admin"  # 显示名称
    receiver = 'xxx@'  
    # 接收邮件，可设置为你的QQ邮箱或者其他邮箱，列表 发送会报错

    # 邮件内容
    message = MIMEText("正文内容", 'plain', 'utf-8')
    message['From'] = "{0}<{1}>".format(sender_name ,sender)
    message['To'] = receiver
    message['Subject'] = Header("标题", 'utf-8')

    try:
        smtpObj = smtplib.SMTP()
        smtpObj.connect(mail_host, 25)  # 25 为 SMTP 端口号
        smtpObj.login(mail_user, mail_pass)
        smtpObj.sendmail(sender, receiver, message.as_string())
        print "邮件发送成功"
        smtpObj.quit()
        smtpObj.close()
    except smtplib.SMTPException as e:
        print "Error: 无法发送邮件", e

# email_helper.py

from email.header import Header
from email.mime.text import MIMEText
from email.utils import parseaddr, formataddr
import smtplib

debug = True  # debug开关


def debug_info(text):
    if debug == True:
        print(text)


class EmailClient(object):
    '邮件发送端初始化类'

    def __init__(self, smtp_server):
        '初始化服务器地址'
        self._smtp_server = smtp_server
        self.addrs = []  # 邮件地址列表, 格式(addr, name)

    def login(self, from_addr, password, from_name=None):
        '登录'
        self._from_addr = from_addr
        self._password = password
        if from_name == None:
            self._from_name = from_addr
        else:
            self._from_name = from_name

        try:
            self.server = smtplib.SMTP(self._smtp_server, 25)
            # server.set_debuglevel(1)
            self.server.login(self._from_addr, self._password)
        except Exception as e:
            return -1  # 登录失败
            debug_info("登录失败")
        else:
            return 0  # 登录成功
            debug_info("登录成功")

    def _send(self, title, text, to_addr, to_name=None):
        '发送邮件'
        if to_name == None: to_name = to_addr

        try:
            # 接受方信息
            msg = MIMEText(text, 'plain', 'utf-8')
            msg['From'] = self._format_addr('%s<%s>' % (
                          self._from_name, self._from_addr))

            msg['To'] = self._format_addr('%s <%s>' % (to_name, to_addr))
            msg['Subject'] = Header(title, 'utf-8').encode()

            # 发送内容
            self.server.sendmail(self._from_addr, to_addr, msg.as_string())

            return 0

        except Exception as e:
            debug_info(e)
            return -1

    def add_address(self, addr, name=None):
        '增加地址到地址列表'
        if name == None: name = addr
        self.addrs.append((addr, name))

    def send_all(self, title, text):
        '发送所有人'
        success = 0
        fail = 0
        for addr, name in self.addrs:
            ret = self._send(title, text, addr, name)
            if ret == 0:
                success += 1
            else:
                fail += 1
        return success, fail

    def __del__(self):
        '析构'
        self.server.quit()

    def _format_addr(self, s):
        '格式化地址'
        name, addr = parseaddr(s)
        return formataddr((Header(name, 'utf-8').encode(), addr))


if __name__ == '__main__':
    # 邮箱服务器地址
    email_client = EmailClient("")

    # 登陆，密码或授权码
    email_client.login("xxxx@", "password")

    # 增加收件人
    email_client.add_address("xxx@")
    email_client.add_address("email")
    email_client.add_address("email")

    # 发送
    title = "邮件标题"
    body = "邮件内容，试试看能不能发送出去"
    success, fail = email_client.send_all(title, body)

    # 返回发送结果
    print("success:", success, "fail:", fail)

# email_demo.py

from email_helper import EmailClient
from datetime import datetime
import time

email_client = EmailClient("")  # 邮箱服务器地址

email_client.login("xxx@", "xxx")  # 登陆

email_client.add_address("xxxx@")  # 增加收件人

#  发送
while True:
    now = datetime.now()
    if now.minute == 0 and now.second == 0:
        title = "整点时间提醒邮件"
        body = "现在时刻：%s"%now
        success, fail = email_client.send_all(title, body)

        print("success:", success, "fail:", fail)  # 返回发送结果
        time.sleep(5)

ps：单独测试没有成功，运行爬虫项目中测试才行

# -*- coding:utf-8 -*-

# 测试邮箱发送
from scrapy.mail import MailSender

mailer = MailSender(smtphost='',
                    mailfrom="xxx@",
                    smtpuser="xxx@",
                    smtppass="xxxxx",
                    smtpport=25)

mailer.send(to=["xxx@"],
            subject="请查收",
            body="hello world")

# -*- coding: utf-8 -*-

import smtplib
from email.mime.text import MIMEText
from email.utils import formataddr


class EmailSender(object):
    # 邮箱配置
    # 服务器地址
    MAIL_HOST = ""
    # 服务器端口 25 或者 465(ssl)
    MAIL_PORT = 465

    # 发件人邮箱账号
    MAIL_USER = "xxx@"
    # 发件人邮箱密码
    MAIL_PASS = "123456"
    # 发件人邮箱别名
    MAIL_NAME = "xxx"

    # 收件人地址
    MAIL_TO = "xxx@"

    @classmethod
    def send(cls, subject, text, to_addrs=None):
        msg = cls._get_email(subject, text)

        # 发送邮件
        if cls.MAIL_PORT == 465:
            server = smtplib.SMTP_SSL(cls.MAIL_HOST)  # ssl 465端口
        else:
            server = smtplib.SMTP(cls.MAIL_HOST, cls.MAIL_PORT)  # 25端口

        # 发送地址
        if to_addrs is None:
            to_addrs = [cls.MAIL_TO]

        server.login(cls.MAIL_USER, cls.MAIL_PASS)  # 登录
        server.sendmail(cls.MAIL_USER, to_addrs, msg.as_string())  # 发送
        server.quit()  # 退出

    @classmethod
    def _get_email(cls, subject, text):

        # 构造邮件
        msg = MIMEText(text, 'plain', 'utf-8')
        # 邮箱昵称、发件人邮箱账号
        msg['From'] = formataddr([cls.MAIL_NAME, cls.MAIL_USER])
        msg['To'] = formataddr([cls.MAIL_TO, cls.MAIL_TO])
        msg['Subject'] = subject
        return msg


if __name__ == '__main__':
    EmailSender.send("你好", "这是内容")