Example of Simple Email Sending Client Implemented by Python

The script is too simple and is provided for learning and reference. Mainly to understand the use of the smtplib library and the implementation of the timeout mechanism. The timeout mechanism is implemented using signal.alarm.

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import time
import sys
import logging
import smtplib
import socket 
import signal
import ConfigParser
from datetime import datetime
from email import encoders
from email.header import Header
from email.mime.text import MIMEText
from email.utils import parseaddr, formataddr
CONF_PATH = "/etc/zabbix/alarm_email.conf"
logging.basicConfig(level=logging.INFO,
          format='%(asctime)s [%(levelname)s]: %(message)s',
          filename='/var/log/zabbix/send_alarm_email.log'
class EmailObject:
  def __init__(self,to_addr,content):
    self.timeout = 10
    self.retry = 3
    self.cp = self._parse_config()
    self.cpl = self._parse_config().sections()
    self.conf = dict(self.cp.items(self.cpl[0])) 
    # common how to use one
    self.to_addr = to_addr
    self.content = content
  # get ConfigParser, for section selection
  def _parse_config(self):
    cp = ConfigParser.ConfigParser()
    cp.read(CONF_PATH)
    return cp
  # set base config
  def _conf_parse(self):
    self.subject = "Zabbix alarm"
    self.from_addr = self.conf["from_addr"]
    self.password = self.conf["password"]
    self.smtp_server = self.conf["smtp_server"]
  def _msg_parse(self):
    # msg = self.content.split("*)
    # state = "alarm" if msg[0] == "PROBLEM" else "ok"
    # severity = msg[1]
    # head_time = map(int,msg[2].split("."))
    # tail_time = map(int,msg[3].split(":"))
    ## if not host#63;
    # event_type = "host."; + msg[4]
    # reason = msg[5].replace("_"," ")
    # alarm_id = int(msg[6])
    # message = msg
    return self.content
  def _change_server(self):
    # if len = 1 and this fun is called, means that all servers have been tried
    if(len(self.cpl) > 1) :
      self.cpl.pop(0)
      self.retry = 3
      self.conf = dict(self.cp.items(self.cpl[0]))
      logging.info("Change server to {}".format(self.cpl[0]))
      self.send_email()
    else:
      logging.warning("No server could be used,try to config more server(now is {}) or increase the timeout [{}]!".format(self.cp.sections(),self.timeout))
      exit()
  def send_email(self):
    # signal handle  
    def handler(signum,frame):
      if self.retry > 0:
        raise AssertionError
      else:
        self._change_server()
    self._conf_parse()
    from_addr = self.from_addr 
    password = self.password
    smtp_server = self.smtp_server
    timeout = self.timeout
    to_addr = self.to_addr
    msg = MIMEText(self.content,'plain','utf-8')-8)
    msg['Subject'] = Header(self.subject, 'utf-8')-8)
    msg['From'] = 'AlarmEmail'+<"+from_addr+">"  
    msg['To'] = "******@******.com"
    try:
      signal.signal(signal.SIGALRM,handler)
      signal.alarm(timeout)
      server = smtplib.SMTP_SSL(smtp_server,465)
      server.login(from_addr, password)
      server.sendmail(from_addr,to_addr, msg.as_string())
      logging.info("Send email successfully!From:[{}],To:[{}],Content:[{}]".format(from_addr,to_addr,self.content))
      server.quit()
      exit()
    except AssertionError:
      self.retry -= 1
      logging.info("Begin to resend email for the {}th times".format(3-self.retry))
      self.send_email()
    except smtplib.SMTPAuthenticationError,e:
      logging.error("Server [{}] authentication failed".format(smtp_server))
      self._change_server()
'''
example:
from emailtest import emailtest
eb = emailtest.EmailObject("******@******.com,"test content")
eb.send_email()
tips:
increase timeout:
  eb.timeout = 10
increase retry times:
  eb.retry = 5
'''

The configuration file reference is as follows:

[default]
from_addr = ******@******.com
password = ******
smtp_server = smtp.******.com
[163]
from_addr = ******@163.com
password = ******
smtp_server = smtp.163.com
[qq]
from_addr = ******@qq.com
password = ******
smtp_server = smtp.qq.com

This example of a simple email sending client implemented in Python, which is all the content I share with you, I hope it can give you a reference, and I also hope that everyone will support the Naihua Tutorial.