发送 HTML 形式的邮件
发送 HTML 形式的邮件，需要 email.mime.text 中的 MIMEText 的 _subtype 设置为 html，并且 _text 的内容应该为 HTML 形式。

import smtplib
from email.mime.text import MIMEText

sender = '***'
receiver = '***'
subject = 'python email test'
smtpserver = 'smtp.163.com'
username = '***'
password = '***'

msg = MIMEText(u'''
你好
''','html','utf-8')

msg['Subject'] = subject

smtp = smtplib.SMTP()
smtp.connect(smtpserver)
smtp.login(username, password)
smtp.sendmail(sender, receiver, msg.as_string())
smtp.quit()

注意：这里的代码并没有把异常处理加入，需要读者自己处理异常。

发送带图片的邮件
发送带图片的邮件是利用 email.mime.multipart 的 MIMEMultipart 以及 email.mime.image 的 MIMEImage:

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(
 ''' Some  HTML  text  and an image.good!''', 'html', 'utf-8')
msgRoot.attach(msgText)

fp = open('/Users/1.jpg', 'rb')
msgImage = MIMEImage(fp.read())
fp.close()

msgImage.add_header('Content-ID', '')
msgRoot.attach(msgImage)

smtp = smtplib.SMTP()
smtp.connect(smtpserver)
smtp.login(username, password)
smtp.sendmail(sender, receiver, msgRoot.as_string())
smtp.quit()

发送带附件的邮件
发送带附件的邮件是利用 email.mime.multipart 的 MIMEMultipart 以及 email.mime.image 的 MIMEImage，重点是构造邮件头信息:

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

sender = '***'
receiver = '***'
subject = 'python email test'
smtpserver = 'smtp.163.com'
username = '***'
password = '***'

msgRoot = MIMEMultipart('mixed')
msgRoot['Subject'] = 'test message'

# 构造附件
att = MIMEText(open('/Users/1.jpg', 'rb').read(), 'base', 'utf-8')
att["Content-Type"] = 'application/octet-stream'
att["Content-Disposition"] = 'attachment; filename="1.jpg"'
msgRoot.attach(att)

smtp = smtplib.SMTP()
smtp.connect(smtpserver)
smtp.login(username, password)
smtp.sendmail(sender, receiver, msgRoot.as_string())
smtp.quit()