SMTP协议的一个重要特点是它能够接力传送邮件。它工作在两种情况下:一是电子邮件从客户机传输到服务器;二是从某一个服务器传输到另一个服务器。
IMAP协议也提供了方便的邮件下载服务,让用户能进行离线阅读。使用IMAP协议的电邮客户端通常把信息保留在服务器上直到用户显式删除。这种特性使得多个客户端可以同时管理一个邮箱。IMAP协议提供了摘要浏览功能,可以让用户在阅读完所有的邮件到达时间、主题、发件人、大小等信息后再决定是否下载。IMAP协议的默认TCP端口号是143。
MIME扩展邮件的格式,用以支持非ASCII编码的文本、非文本附件以及包含多个部分 (multi-part) 的邮件体等。
Python email模块
1. class email.message.MessageMsg.add_header(_name, _value, **_params): 添加邮件头字段。
2. class email.mime.base.MIMEBase(_maintype, _subtype, **_params)所有MIME类的基类,是email.message.Message类的子类。
3. class email.mime.multipart.MIMEMultipart()这个类是MIMEBase的直接子类,用来生成包含多个部分的邮件体的MIME对象。
4. class email.mime.text.MIMEText(_text)使用字符串_text来生成MIME对象的主体文本。
发邮件代码范例:
#!/usr/bin/env python # -*- coding: UTF-8 -*- from email.mime.multipart import MIMEMultipart from email.mime.base import MIMEBase from email.mime.text import MIMEText # python 2.3.*: email.Utils email.Encoders from email.utils import COMMASPACE,formatdate from email import encoders import os #server['name'], server['user'], server['passwd'] def send_mail(server, fro, to, subject, text, files=[]): assert type(server) == dict assert type(to) == list assert type(files) == list msg = MIMEMultipart() msg['From'] = fro msg['Subject'] = subject msg['To'] = COMMASPACE.join(to) #COMMASPACE==', ' msg['Date'] = formatdate(localtime=True) msg.attach(MIMEText(text)) for file in files: part = MIMEBase('application', 'octet-stream') #'octet-stream': binary data part.set_payload(open(file, 'rb'.read())) encoders.encode_base64(part) part.add_header('Content-Disposition', 'attachment; filename="%s"' % os.path.basename(file)) msg.attach(part) import smtplib smtp = smtplib.SMTP(server['name']) smtp.login(server['user'], server['passwd']) smtp.sendmail(fro, to, msg.as_string()) smtp.close()
文件形式的邮件:
#!/usr/bin/env python3 #coding: utf-8 import smtplib from email.mime.text import MIMEText from email.header import Header sender = '***' receiver = '***' subject = 'python email test' smtpserver = 'smtp.163.com' username = '***' password = '***' msg = MIMEText('你好','text','utf-8') #中文需参数‘utf-8’,单字节字符不需要 msg['Subject'] = Header(subject, 'utf-8') smtp = smtplib.SMTP() smtp.connect('smtp.163.com') smtp.login(username, password) smtp.sendmail(sender, receiver, msg.as_string()) smtp.quit()HTML形式的邮件
#!/usr/bin/env python3 #coding: utf-8 import smtplib from email.mime.text import MIMEText sender = '***' receiver = '***' subject = 'python email test' smtpserver = 'smtp.163.com' username = '***' password = '***' msg = MIMEText('<html><h1>你好</h1></html>','html','utf-8') msg['Subject'] = subject smtp = smtplib.SMTP() smtp.connect('smtp.163.com') smtp.login(username, password) smtp.sendmail(sender, receiver, msg.as_string()) smtp.quit()
带图片的HTML形式的邮件
#!/usr/bin/env python3 #coding: utf-8 import smtplib from email.mime.multipart import MIMEMultipart from email.mime.text import MIMEText from email.mime.image import MIMEImage sender = '***' receiver = '***' subject = 'python email test' smtpserver = 'smtp.163.com' username = '***' password = '***' msgRoot = MIMEMultipart('related') msgRoot['Subject'] = 'test message' msgText = MIMEText('<b>Some <i>HTML</i> text</b> and an image.<br><img src="cid:image1"><br>good!','html','utf-8') msgRoot.attach(msgText) fp = open('h:\\python\\1.jpg', 'rb') msgImage = MIMEImage(fp.read()) fp.close() msgImage.add_header('Content-ID', '<image1>') msgRoot.attach(msgImage) smtp = smtplib.SMTP() smtp.connect('smtp.163.com') smtp.login(username, password) smtp.sendmail(sender, receiver, msgRoot.as_string()) smtp.quit()
带附件的邮件
#!/usr/bin/env python3 #coding: utf-8 import smtplib from email.mime.multipart import MIMEMultipart from email.mime.text import MIMEText from email.mime.image import MIMEImage sender = '***' receiver = '***' subject = 'python email test' smtpserver = 'smtp.163.com' username = '***' password = '***' msgRoot = MIMEMultipart('related') msgRoot['Subject'] = 'test message' #构造附件 att = MIMEText(open('h:\\python\\1.jpg', 'rb').read(), 'base64', 'utf-8') att["Content-Type"] = 'application/octet-stream' att["Content-Disposition"] = 'attachment; filename="1.jpg"' msgRoot.attach(att) smtp = smtplib.SMTP() smtp.connect('smtp.163.com') smtp.login(username, password) smtp.sendmail(sender, receiver, msgRoot.as_string()) smtp.quit()
群邮件
#!/usr/bin/env python3 #coding: utf-8 import smtplib from email.mime.text import MIMEText sender = '***' receiver = ['***','****',……] subject = 'python email test' smtpserver = 'smtp.163.com' username = '***' password = '***' msg = MIMEText('你好','text','utf-8') msg['Subject'] = subject smtp = smtplib.SMTP() smtp.connect('smtp.163.com') smtp.login(username, password) smtp.sendmail(sender, receiver, msg.as_string()) smtp.quit()
各种元素都包含的邮件
#!/usr/bin/env python3 #coding: utf-8 import smtplib from email.mime.multipart import MIMEMultipart from email.mime.text import MIMEText from email.mime.image import MIMEImage sender = '***' receiver = '***' subject = 'python email test' smtpserver = 'smtp.163.com' username = '***' password = '***' # Create message container - the correct MIME type is multipart/alternative. msg = MIMEMultipart('alternative') msg['Subject'] = "Link" # Create the body of the message (a plain-text and an HTML version). text = "Hi!\nHow are you?\nHere is the link you wanted:\nhttp://www.python.org" html = """\ <html> <head></head> <body> <p>Hi!<br> How are you?<br> Here is the <a href="http://www.python.org">link</a> you wanted. </p> </body> </html> """ # Record the MIME types of both parts - text/plain and text/html. part1 = MIMEText(text, 'plain') part2 = MIMEText(html, 'html') # Attach parts into message container. # According to RFC 2046, the last part of a multipart message, in this case # the HTML message, is best and preferred. msg.attach(part1) msg.attach(part2) #构造附件 att = MIMEText(open('h:\\python\\1.jpg', 'rb').read(), 'base64', 'utf-8') att["Content-Type"] = 'application/octet-stream' att["Content-Disposition"] = 'attachment; filename="1.jpg"' msg.attach(att) smtp = smtplib.SMTP() smtp.connect('smtp.163.com') smtp.login(username, password) smtp.sendmail(sender, receiver, msg.as_string()) smtp.quit()