sendmail.py3 - Small sendmail lib for Python 3

sendmail.py

import logging
log = logging.getLogger(__name__)

import codecs

from subprocess import Popen, PIPE

from email.mime.multipart import MIMEMultipart
from email.mime.nonmultipart import MIMENonMultipart
from email.mime.text import MIMEText


class Basemail(object):
    def encode(self, mailfrom, rcptto, subject, replyto=None, cc=None,
                bcc=None, htmlpart='', textpart='', charset='utf-8'):
        if htmlpart and textpart:
            message = MIMEMultipart('alternative')
        elif htmlpart:
            message = MIMENonMultipart('text','html')
        elif textpart:
            message = MIMENonMultipart('text','plain')
        else:
            return None
        
        message['From'] = str(mailfrom)
        message['To'] = ', '.join(rcptto) if isinstance(rcptto,list) else rcptto
        message['Subject'] = str(subject)
        if replyto:
            message['Reply-To'] = str(replyto)
        if cc:
            message['Cc'] = ', '.join(cc) if isinstance(cc,list) else cc
        if bcc:
            message['Bcc'] = ', '.join(bcc) if isinstsance(bcc,list) else bcc
        
        htmlpart = codecs.encode(htmlpart, charset)
        textpart = codecs.encode(textpart, charset)
        
        if htmlpart and textpart:
            plaintext = MIMEText(textpart.decode(), 'plain')
            htmltext = MIMEText(htmlpart.decode(), 'html')
            message.attach(plaintext)
            message.attach(htmltext)
        elif htmlpart:
            message.set_payload(htmlpart, charset=charset)
        elif textpart:
            message.set_payload(textpart, charset=charset)
        else:
            return None

        self.message = message # Compatibility with old api.

        return message


class SendMail(Basemail):
    def __init__(self, sendmail_path='/usr/sbin/sendmail'):
        self.sendmail_path = sendmail_path

    def send(self, *args):
        if args:
            message = args[0]
        else:
            message = self.message # Compatibility with old api.

        sendmail = Popen([self.sendmail_path, "-t"], stdin=PIPE)
        sendmail.communicate(message.as_string().encode())