基础版:

#!python
#文件名: demo_smtp.py

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

sender='gudxxx@126.com'#发送者
recvs=['gudxxx@qq.com']#接受者

message=MIMEText('python发送邮件测试....','plain','utf-8')
message['From']='gudxxx@126.com'#设置发送者(存于邮件内的信息)
message['To']='gudxxx@qq.com'#设置接受者(存于邮件内的信息)

subject='Python测试之Gudxxx发送'
message['Subject']=Header(subject,'utf-8')#设置右键主题(标题)

try:
    smtp=smtplib.SMTP()#得到一个邮件发送服务器实例
    smtp.connect('smtp.126.com',25)#绑定发送服务器主机,端口(端口可以省略)
    smtp.login('gudxxx@126.com','**********')#验证身份
    smtp.sendmail(sender,recvs,message.as_string())#发送邮件
    print('邮件发送成功')
except :
    print('出现未知异常,无法发送邮件')
    raise

终极复杂版(网页,网页中带图片,带附件)

#!python
#文件名: demo_smtp2.py

import smtplib
from email.mime.image import MIMEImage
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.header import Header

sender='guddqs@126.com'
recvs=['guddqs@qq.com']

#定义邮件信息实例
msgRoot=MIMEMultipart('root')

msgRoot['From']='guddqs@126.com'
msgRoot['To'] = 'guddqs@qq.com'
msgRoot['Subject'] = Header('python邮件终极测试','utf-8')

mail_msg="""
<p>python 终极测试 </p>
<p><a href='www.google.com'>谷歌走一波</a></p>
<p>第一项:图片</p>
<p><img src='cid:image1'/></p>
""";

#先将邮件HTML文本信息加入邮件信息实例attach方法!
msgRoot.attach(MIMEText(mail_msg,'html','utf-8'))

#构建一个图片
fp=open('tank.png','rb')
msgImage=MIMEImage(fp.read())
fp.close()

#attach一个图片,图片信息设置好cid
msgImage.add_header('Content-ID','<image1>')
msgRoot.attach(msgImage)

#构造和attach2个文件,不管是文本还是其他类型(doc,jar,exe等)
file1=MIMEText(open('tank.jar','rb').read(),'base64','utf-8')
file1['Content-Type']='application/octet-stream'
file1['Content-Disposition']='attachment; filename="tank.jar"'
msgRoot.attach(file1)

file2=MIMEText(open('foot.txt','rb').read(),'base64','utf-8')
file2['Content-Type']='application/octet-stream'
file2['Content-Disposition']='attachment; filename="foot.txt"'
msgRoot.attach(file2)

#最后连接smtp服务器发送邮件
try:
    smtp=smtplib.SMTP()
    smtp.connect('smtp.126.com')
    smtp.login('guddqs@126.com','*****')
    smtp.sendmail(sender,recvs,msgRoot.as_string())
    print('发送成功!')
except:
    print('发送失败!')
    raise