smtplib python2.7 python3.x ， 。 ， 。
：https://docs.python.org/3/library/smtplib.html?highlight=smtplib

， ：  

$ pip3 install smtplib
Collecting smtplib
  ERROR: Could not find a version that satisfies the requirement smtplib (from versions: none)
ERROR: No matching distribution found for smtplib

使用163.com送信メール:

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

import smtplib
from email.mime.text import MIMEText

#     SMTP   
mail_host = "smtp.163.com"  # SMTP   
mail_port = 465
mail_user = "[email protected]"  #    
mail_pass = "esefskjhurhsjeisjie"  #     ，      (            ，    "        ")

sender = '[email protected]' #      (    ,      )
receivers = [ '[email protected]' ] #     ，      QQ        

content = '  Python    ！'
title = 'Python    '  #     

def sendEmail():
    message = MIMEText(content, 'plain', 'utf-8')  #   ,   ,   
    message['From'] = "{}".format(sender)
    message['To'] = ",".join(receivers)
    message['Subject'] = title

    try:
        smtpObj = smtplib.SMTP_SSL(mail_host, mail_port)  #   SSL  ,      465
        smtpObj.login(mail_user, mail_pass)  #     
        smtpObj.ehlo()
        smtpObj.sendmail(sender, receivers, message.as_string())  #   
        smtpObj.close()
        print("mail has been send successfully.")
    except smtplib.SMTPException as e :
        print(e)

if __name__ == '__main__':
    sendEmail()

163.com ：http://help.163.com/09/1224/17/5RAJ4LMH00753VB8.html
gmailを使用してメールを送信するには:

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

import smtplib
from email.mime.text import MIMEText

#     SMTP   
mail_host = "smtp.gmail.com"  # SMTP   
mail_port = 465
mail_user = "[email protected]"  #    
mail_pass = "esefskjhurhsjeisjie"  #     ，      (goole      2   ，    "        ")

sender = '[email protected]' #      (    ,      )
receivers = [ '[email protected]' ] #     ，      QQ        

content = '  Python    ！'
title = 'Python    '  #     

def sendEmail():
    message = MIMEText(content, 'plain', 'utf-8')  #   ,   ,   
    message['From'] = "{}".format(sender)
    message['To'] = ",".join(receivers)
    message['Subject'] = title

    try:
        smtpObj = smtplib.SMTP_SSL(mail_host, mail_port)  #   SSL  ,      465
        smtpObj.login(mail_user, mail_pass)  #     
        smtpObj.ehlo()
        smtpObj.sendmail(sender, receivers, message.as_string())  #   
        smtpObj.close()
        print("mail has been send successfully.")
    except smtplib.SMTPException as e :
        print(e)

if __name__ == '__main__':
    sendEmail()

gmail ：https://support.google.com/mail/?p=BadCredentials
QQメールボックスを使用してメールを送信します.
QQメールサーバー:smtp.qq.comは、テンセント企業のメールボックスであれば、そのサーバーはsmtpです.exmail.qq.com、方式は上の163に与える.comはgmailと同じです.
添付ファイル付きメールを送信:

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

import smtplib
from email.mime.text import MIMEText
from email.mime.application import MIMEApplication
from email.mime.multipart import MIMEMultipart
import email.mime.text

#     SMTP   
mail_host = "smtp.gmail.com"  # SMTP   
mail_port = 465
mail_user = "[email protected]"  #    
mail_pass = "eskeskefksekjsefsek"  #     ，      (goole      2   ，    "        ")

sender = '[email protected]' #      (    ,      )
receivers = [ '[email protected]' ] #     ，      QQ        

content = '  Python    ！'
title = 'Python    '  #     


def sendEmail():
    message = MIMEMultipart()
    message['From'] = "{}".format(sender)
    message['To'] = ",".join(receivers)
    message['Subject'] = title

    #       
    txt = MIMEText(content, 'plain', 'utf-8')  #   ,   ,   
    message.attach(txt)

    #     ，       。        ，    part_2,part_3 ，    part_2.add_header() msg.attach(part_2)  。
    part = MIMEApplication(open('/Users/my-user/PycharmProjects/py-flask/templates/list.html', 'rb').read())
    part.add_header('Content-Disposition', 'attachment', filename="list.html")  #       ,         ,         .
    message.attach(part)

    try:
        smtpObj = smtplib.SMTP_SSL(mail_host, mail_port)  #   SSL  ,      465
        smtpObj.login(mail_user, mail_pass)  #     
        smtpObj.ehlo()
        smtpObj.sendmail(sender, receivers, message.as_string())  #   
        smtpObj.close()
        print("mail has been send successfully.")
    except smtplib.SMTPException as e :
        print(e)

if __name__ == '__main__':
    sendEmail()

HTML形式のメールを送信:
基本的に上と同じですが、修正箇所は2つあります.
1.コンテンツはhtml形式のテキストであってもよい.
content='私はPythonで過程を勉強します!baidu.com '
*aのhrefはhttp/httpを削除する必要があります.QQメールボックスにプロトコルを持たないと、リンクが開きません. 
2.メール本文、html形式を使用:MIMEText(content,'html','utf-8')

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

import smtplib
from email.mime.text import MIMEText

#     SMTP   
mail_host = "smtp.gmail.com"  # SMTP   
mail_port = 465
mail_user = "[email protected]"  #    
mail_pass = "esefskjhurhsjeisjie"  #     ，      (goole      2   ，    "        ")

sender = '[email protected]' #      (    ,      )
receivers = [ '[email protected]' ] #     ，      QQ        

content = '
  Python    ！
baidu.com'
title = 'Python    '  #     

def sendEmail():
    message = MIMEText(content, 'html', 'utf-8')  #   ,   ,   
    message['From'] = "{}".format(sender)
    message['To'] = ",".join(receivers)
    message['Subject'] = title

    try:
        smtpObj = smtplib.SMTP_SSL(mail_host, mail_port)  #   SSL  ,      465
        smtpObj.login(mail_user, mail_pass)  #     
        smtpObj.ehlo()
        smtpObj.sendmail(sender, receivers, message.as_string())  #   
        smtpObj.close()
        print("mail has been send successfully.")
    except smtplib.SMTPException as e :
        print(e)

if __name__ == '__main__':
    sendEmail()

： https://www.runoob.com/python/python-email.html https://stackabuse.com/how-to-send-emails-with-gmail-using-python/ ：
https://www.runoob.com/python/python-email.html