A simple SMTP mailer written in Python allowing file attachments (gmail is the default).

PyMailer.py

#!/usr/bin/env python

import urllib2, sys, os, smtplib, argparse
from email.MIMEMultipart import MIMEMultipart
from email.MIMEBase import MIMEBase
from email.MIMEText import MIMEText
from email.Utils import formatdate
from email import encoders

parser = argparse.ArgumentParser(description='Send messages through SMTP server from the command line.')
parser.add_argument(
    '-t', '--to',
    type=str,
    nargs='+',
    required=True,
    help='The recipient(s) of your message (list multiple separated by a space), required'
)
parser.add_argument(
    '-s', '--subject', 
    type=str,
    required=True, 
    help='The subject line of your message, required.'
)
parser.add_argument(
    '-m', '--message',
    type=str,
    required=True,
    help='The body of your message, required.'
)
parser.add_argument(
    '-a', '--attach',
    nargs='+',
    help='Attach files, list files separated by a space for more than 1.'
)
parser.add_argument(
    '-u', '--username',
    type=str,
    default='<define a default email if desired>',
    help='The [gmail] username you want to send mail as.'
)
parser.add_argument(
    '-p', '--password',
    type=str,
    default='<define password for email, careful!>',
    help='The password for your [gmail] username, only use if -u is elected.'
)
parser.add_argument(
    '--server',
    type=str,
    default='smtp.gmail.com',
    help='You can define a different server if you don\'t want to use gmail.'
)
parser.add_argument(
    '--port',
    type=int,
    default='587',
    help='The port through which the server connects.'
)

args = parser.parse_args()

def buildMsg():
    global args
    msg = MIMEMultipart()
    if (args.to > 1):
        msg['To'] = ', '.join(args.to)
    else:
        msg['To'] = args.to
    msg['From'] = args.username
    msg['Subject'] = args.subject
    msg['Date'] = formatdate( localtime=True )
    
    body = MIMEText('text','plain')
    body.set_payload( args.message )
    msg.attach( body )

    try:
        for a in args.attach:
            part = MIMEBase('application', 'octet-stream')
            part.set_payload( open(a, 'rb').read() )
            encoders.encode_base64( part )
            part.add_header('Content-Disposition', 'attachment; filename="%s"' %(os.path.basename(a)) )
            msg.attach( part )
    except TypeError:
        pass

    return msg


def mail( message ):
    msg = message
    session = smtplib.SMTP( args.server, args.port)
    session.ehlo()
    session.starttls()
    session.ehlo

    session.login(args.username, args.password)

    goodies = msg.as_string()

    session.sendmail(args.username, args.to, msg.as_string())

    session.quit()
    #os.system('notify-send "IP Update Email Sent"') # System Popup notification

def main():
    mail( buildMsg() )

if __name__ == '__main__':
    main()