：SMTP邮件投递代码之Python3.6及以上调用示例

阿里邮箱配置

SMTP服务器地址：smtp.sg.aliyun.com

端口：非加密25，SSL加密465

# -*- coding:utf-8 -*-
import smtplib
import email
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.header import Header
# 发件人邮箱地址
from email.utils import formataddr

username = ''
# 发件人邮箱密码
password = ''
# 自定义的回复地址
replyto = ''

From = formataddr(["自定义发信昵称",'' ]) # 昵称+发信地址(或代发)
to = ','.join(['', ''])

cc = ''
bcc = ''

# 收件人地址或是地址列表，支持多个收件人
rcptto = [to, cc, bcc]

#msg是邮件需要显示的信息
msg = MIMEMultipart('alternative')
msg['Subject'] = Header('smtp发信测试')
msg['from'] = From
msg['rcptto'] = ','.join(rcptto)
print('收件列表：', msg['rcptto'], type(msg['rcptto']))

msg['Reply-to'] = replyto
msg['Message-id'] = email.utils.make_msgid()
msg['Date'] = email.utils.formatdate()

# 构建alternative的text/plain部分
textplain = MIMEText('本邮件仅做测试', _subtype='plain', _charset='UTF-8')
msg.attach(textplain)
# 构建alternative的text/html部分
texthtml = MIMEText('这是一封测试', _subtype='html', _charset='UTF-8')
msg.attach(texthtml)

try:
    client = smtplib.SMTP_SSL('smtp.sg.aliyun.com', 465)
    print('服务和端口连通')
except:
    print('服务和端口不通')
    exit(1)

#开启DEBUG模式
try:
    client.set_debuglevel(0)
    client.login(username, password)
    print('账密验证成功')
except:
    print('账密验证失败')
    exit(1)

client.sendmail(username, msg['rcptto'].split(','), msg.as_string())
client.quit()
print('邮件发送成功！')