Overview

I wanted to make a program that doesn't require specifying a mail server, so I wrote it.

First, insert the module for pulling MX records.

pip install dnspython

Run

Pass the recipient and sender's email address as arguments.

python sendmail.py [email protected] [email protected]

Implementation

sendmail.py

# -*- coding: utf-8 -*-

import smtplib
from email.MIMEText import MIMEText
from email.Header import Header
from email.Utils import formatdate
import sys
import dns.resolver

if __name__ == "__main__":

    argvs = sys.argv

    if len(argvs) != 3:
        print 'Usage arg1 = to_address, arg2 = from_address'
        quit()

    to_address   = argvs[1]
    from_address = argvs[2]
    to_list = to_address.split('@')

    to_address = '<' + to_address + '>'
    from_address = '<' + from_address + '>'

    if len(to_list) < 2:
        print 'format error to_address'
        quit()

    domain = to_list[1]
    mailserver = dns.resolver.query(domain, 'MX')

    if len(mailserver) < 1:
        print 'not found mx recored'
        quit()

    mailserver = mailserver[0].to_text().split(' ')
    mailserver = mailserver[1][:-1]
    print mailserver

    charset = "ISO-2022-JP"
    subject = u"this is Python test mail!"
    text    = u"this is Python test mail!"

    msg = MIMEText(text.encode(charset),"plain",charset)
    msg["Subject"] = Header(subject,charset)
    msg["From"]    = from_address
    msg["To"]      = to_address
    msg["Date"]    = formatdate(localtime=True) 

    smtp = smtplib.SMTP(mailserver)
    smtp.sendmail(from_address,to_address,msg.as_string())
    smtp.close()

It seems that Gmail has some restrictions on anti-spam measures, and if you send it, you may get the following error.

smtplib.SMTPServerDisconnected: Connection unexpectedly closed: [Errno 54] Connection reset by peer

Send an email directly by pulling an MX record from your email address in Python

Overview

Run

Implementation