Send email in HTML format with embedded attachments and images.

send_email.py

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

"""
This module is used to send emails in HTML format, with embedded attachments and images.
"""

__version__ = '0.2'
__date__ = '2016-04-25'
__author__ = 'Guangning Yu'

import os
import smtplib
import mimetypes
from email.MIMEMultipart import MIMEMultipart
from email.MIMEText import MIMEText
from email.MIMEBase import MIMEBase
from email.MIMEImage import MIMEImage
from email import encoders
from optparse import OptionParser

def send_mail(mail_host='192.168.0.1', subject=None, sender='noreply@example.com', to=[], cc=[], bcc=[], content=None, attach=[], images=[]):

    def split(text):
        return text.strip().replace(' ','').replace(',',';').split(';')

    def filter_valid(list):
        list = [i for i in list if '@example.com' in i]
        return list

    def to_str(list):
        return ';'.join(list)

    def print_info():
        print 'Subject: %s' % subject
        if sender:
            print 'From: %s' % sender
        if to:
            print 'To: %s' % to_str(to)
        if cc:
            print 'Cc: %s' % to_str(cc)
        if bcc:
            print 'Bcc: %s' % to_str(bcc)
        if attachs:
            print 'Attachments:'
            for i in attachs:
                print '    %s' % i
        if images:
            print 'Images:'
            for i in images:
                print '    %s' % i

    # Deal with parameters
    subject = subject
    sender  = sender
    to      = filter_valid(split(to)  if to  else [])
    cc      = filter_valid(split(cc)  if cc  else [])
    bcc     = filter_valid(split(bcc) if bcc else [])
    content = content
    attachs = [os.path.abspath(file) for file in split(attach)] if attach else []
    images  = [os.path.abspath(file) for file in split(images)] if images else []

    # Compose the message
    receivers = []
    msg = MIMEMultipart('related')
    if subject:
        msg['Subject'] = subject
    if sender:
        msg['From'] = sender
    if to:
        msg['To'] = to_str(to)
        receivers += to
    if cc:
        msg['Cc'] = to_str(cc)
        receivers += cc
    if bcc:
        receivers += bcc

    # 1.attach email body
    body = MIMEMultipart('alternative')
    if content:
        with open(content, 'rb') as f:
            content = f.read()
        content = MIMEText(content, _subtype='html')
        body.attach(content)
    else:
        content = MIMEText('')
        body.attach(content)
    msg.attach(body)

    # 2.attach attachments
    if attachs:
        for f in attachs:
            ctype, encoding = mimetypes.guess_type(f)
            maintype = None
            subtype = None
            if ctype:
                maintype, subtype = ctype.split('/', 1)
            attach = MIMEBase(maintype, subtype)
            with open(f, 'rb') as fp:
                attach.set_payload(fp.read())
            file_name = f.split('/')[-1]
            encoders.encode_base64(attach)
            attach.add_header('Content-Disposition','attachment', filename=file_name)
            msg.attach(attach)

    # 3.attach images (note: the "img src" should have been added in the body)
    if images:
        for i in images:
            image_name = i.split('/')[-1]
            with open(i, 'rb') as f:
                image_content = f.read()
            image = MIMEImage(image_content)
            image.add_header('Content-ID', '<%s>' % image_name)
            msg.attach(image)

    # Send the email
    if sender and receivers:
        print_info()
        s = smtplib.SMTP()
        s.connect(mail_host)
        s.sendmail(sender, receivers, msg.as_string())
        s.close()
    else:
        raise Exception("请指定发件人和收件人")

if __name__ == '__main__':

    parser = OptionParser()
    parser.add_option("-s", dest="subject", default=None,               help='e.g."Weekly Report"')
    parser.add_option("-f", dest="sender",  default='noreply@example.com', help='e.g."noreply@example.com"')
    parser.add_option("-r", dest="to",      default=None,               help='e.g."lilei001@example.com;hanmeimei001@example.com"')
    parser.add_option("-c", dest="cc",      default=None,               help='e.g."lily@example.com;lucy@example.com"')
    parser.add_option("-v", dest="bcc",     default=None,               help='e.g."polly@example.com"')
    parser.add_option("-b", dest="content", default=None,               help='e.g."result.html"')
    parser.add_option("-a", dest="attach",  default=None,               help='e.g."result.csv;result.gz"')
    parser.add_option("-i", dest="images",  default=None,               help='e.g."img1.jpg;img2.jpg"')
    (options, args) = parser.parse_args()

    send_mail(
        subject = options.subject,
        sender  = options.sender,
        to      = options.to,
        cc      = options.cc,
        bcc     = options.bcc,
        content = options.content,
        attach  = options.attach,
        images  = options.images
    )