发邮件是一种很常见的操作，本篇主要介绍一下如何用python实现自动发件。

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import smtplib
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from email.header import Header
from email.mime.image import MIMEImage
import time
mail_host="smtp.126.com"
mail_user="xxx@126.com"
mail_pass="******"#注意如果邮箱开启了授权码，此处要填写授权码，否则会报smtplib.SMTPAuthenticationError: (535, b'Error: authentication failed')
sender="xxx@126.com"
receiver = ['邮箱1','邮箱2']#群发邮件
for i in range(n):#自定义循环发多少遍
	try:
		message = MIMEMultipart()
 	message["From"] = Header(sender)
 	message["To"] = ','.join(receiver)
 	message["Subject"] = Header("主题", "utf-8").encode()#主题
 	message.attach(MIMEText("正文", "plain", "utf-8"))#正文
 	"""
 	定附件
 	"""
 	att = MIMEText(open(r'C:\Users\Administrator\Desktop\1.txt').read(), "base64", "utf-8")
 	att["Content-Type"] = 'application/octet-stream'
 	 	att.add_header("Content-Disposition", 'attachment', filename="1.txt")#这一步可避免文件不能正常打开
 	message.attach(att)
 	"""
 	构造图片（以附件形式上传）
 	"""
 	image = MIMEImage(open(r'C:\Users\Administrator\Desktop\1.jpg', 'rb').read())
 	image.add_header('Content-ID', '')#可避免图片不能正常打开
 	image["Content-Disposition"] = 'attachment; filename="picture.jpg"'
 	message.attach(image)
 		"""
 		发送邮件
 		"""
 	smtp = smtplib.SMTP_SSL(host=mail_host)
 	smtp.connect(host=mail_host, port=465)
 	smtp.login(mail_user, mail_pass)
 	smtp.sendmail(sender, message['To'].split(','), message.as_string())
 	print("在%s第" % ctime(), str(i+1), "封邮件发送")
 	smtp.quit()
	except smtplib.SMTPException as e:
  	raise e

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