python 3.6以上:

# -*- coding:utf-8 -*-
import smtplib
import email
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.mime.image import MIMEImage
from email.mime.base import MIMEBase
from email.mime.application import MIMEApplication
from email.header import Header
# 发件人地址,通过控制台创建的发件人地址
username = '***'
# 发件人密码,通过控制台创建的发件人密码
password = '***'
# 自定义的回复地址
replyto = '***'
# 收件人地址或是地址列表,支持多个收件人,最多30个
#rcptto = ['***', '***']
rcptto = '***'
# 构建alternative结构
msg = MIMEMultipart('alternative')
msg['Subject'] = Header('自定义信件主题')
msg['From'] = '%s <%s>' % (Header('自定义发信昵称'), username)
msg['To'] = rcptto
msg['Reply-to'] = replyto
msg['Message-id'] = email.utils.make_msgid()
msg['Date'] = email.utils.formatdate() 
# 构建alternative的text/plain部分
textplain = MIMEText('自定义TEXT纯文本部分', _subtype='plain', _charset='UTF-8')
msg.attach(textplain)
# 构建alternative的text/html部分
texthtml = MIMEText('自定义HTML超文本部分', _subtype='html', _charset='UTF-8')
msg.attach(texthtml)
# 发送邮件
try:
    client = smtplib.SMTP()
    #python 2.7以上版本,若需要使用SSL,可以这样创建client
    #client = smtplib.SMTP_SSL()
    #SMTP普通端口为25或80
    client.connect('smtpdm.aliyun.com', 25)
    #开启DEBUG模式
    client.set_debuglevel(0)
    client.login(username, password)
    #发件人和认证地址必须一致
    #备注:若想取到DATA命令返回值,可参考smtplib的sendmaili封装方法:
    #      使用SMTP.mail/SMTP.rcpt/SMTP.data方法
    client.sendmail(username, rcptto, msg.as_string())
    client.quit()
    print('邮件发送成功!')
except smtplib.SMTPConnectError as e:
    print('邮件发送失败,连接失败:', e.smtp_code, e.smtp_error)
except smtplib.SMTPAuthenticationError as e:
    print('邮件发送失败,认证错误:', e.smtp_code, e.smtp_error)
except smtplib.SMTPSenderRefused as e:
    print('邮件发送失败,发件人被拒绝:', e.smtp_code, e.smtp_error)
except smtplib.SMTPRecipientsRefused as e:
    print('邮件发送失败,收件人被拒绝:', e.smtp_code, e.smtp_error)
except smtplib.SMTPDataError as e:
    print('邮件发送失败,数据接收拒绝:', e.smtp_code, e.smtp_error)
except smtplib.SMTPException as e:
    print('邮件发送失败, ', str(e))
except Exception as e:
    print('邮件发送异常, ', str(e))

3。6以下:

# -*- coding:utf-8 -*-
import smtplib
import email
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.mime.image import MIMEImage
from email.mime.base import MIMEBase
from email.mime.application import MIMEApplication
from email.header import Header
# 发件人地址,通过控制台创建的发件人地址
username = '***'
# 发件人密码,通过控制台创建的发件人密码
password = '***'
# 自定义的回复地址
replyto = '***'
# 收件人地址或是地址列表,支持多个收件人,最多30个
#receivers = ['xxx@alx.com', 'xxx@xx.com']
#rcptto = ','.join(rcptto)
rcptto = '***'
# 构建alternative结构
msg = MIMEMultipart('alternative')
msg['Subject'] = Header('自定义信件主题'.decode('utf-8')).encode()
msg['From'] = '%s <%s>' % (Header('自定义发信昵称'.decode('utf-8')).encode(), username)
msg['To'] = rcptto
msg['Reply-to'] = replyto
msg['Message-id'] = email.utils.make_msgid()
msg['Date'] = email.utils.formatdate() 
# 构建alternative的text/plain部分
textplain = MIMEText('自定义TEXT纯文本部分', _subtype='plain', _charset='UTF-8')
msg.attach(textplain)
# 构建alternative的text/html部分
texthtml = MIMEText('自定义HTML超文本部分', _subtype='html', _charset='UTF-8')
msg.attach(texthtml)
# 发送邮件
try:
    client = smtplib.SMTP()
    #python 2.7以上版本,若需要使用SSL,可以这样创建client
    #client = smtplib.SMTP_SSL()
    #SMTP普通端口为25或80
    client.connect('smtpdm.aliyun.com', 25)
    #开启DEBUG模式
    client.set_debuglevel(0)
    client.login(username, password)
    #发件人和认证地址必须一致
    #备注:若想取到DATA命令返回值,可参考smtplib的sendmaili封装方法:
    #      使用SMTP.mail/SMTP.rcpt/SMTP.data方法
    client.sendmail(username, rcptto, msg.as_string())
    #支持多个收件人
    #client.sendmail(username, receivers, msg.as_string())
    client.quit()
    print '邮件发送成功!'
except smtplib.SMTPConnectError, e:
    print '邮件发送失败,连接失败:', e.smtp_code, e.smtp_error
except smtplib.SMTPAuthenticationError, e:
    print '邮件发送失败,认证错误:', e.smtp_code, e.smtp_error
except smtplib.SMTPSenderRefused, e:
    print '邮件发送失败,发件人被拒绝:', e.smtp_code, e.smtp_error
except smtplib.SMTPRecipientsRefused, e:
    print '邮件发送失败,收件人被拒绝:', e.smtp_code, e.smtp_error
except smtplib.SMTPDataError, e:
    print '邮件发送失败,数据接收拒绝:', e.smtp_code, e.smtp_error
except smtplib.SMTPException, e:
    print '邮件发送失败, ', e.message
except Exception, e:
    print '邮件发送异常, ', str(e)

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