¿Cómo enviar un correo electrónico utf-8?

¿Cómo enviar un correo electrónico utf8, por favor?

import sys
import smtplib
import email
import re
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
def sendmail(firm, fromEmail, to, template, subject, date):
 with open(template, encoding="utf-8") as template_file:
 message = template_file.read()
 message = re.sub(r"{{\s*firm\s*}}", firm, message)
 message = re.sub(r"{{\s*date\s*}}", date, message)
 message = re.sub(r"{{\s*from\s*}}", fromEmail, message)
 message = re.sub(r"{{\s*to\s*}}", to, message)
 message = re.sub(r"{{\s*subject\s*}}", subject, message)
 msg = MIMEMultipart("alternative")
 msg.set_charset("utf-8")
 
 msg["Subject"] = subject
 msg["From"] = fromEmail
 msg["To"] = to
 #Read from template
 html = message[message.find("html:") + len("html:"):message.find("text:")].strip()
 text = message[message.find("text:") + len("text:"):].strip()
 part1 = MIMEText(html, "html")
 part2 = MIMEText(text, "plain")
 
 msg.attach(part1) 
 msg.attach(part2)
 try:
 server = smtplib.SMTP("10.0.0.5")
 server.sendmail(fromEmail, [to], msg.as_string())
 return 0
 except Exception as ex:
 #log error
 #return -1
 #debug
 raise ex
 finally:
 server.quit()
if __name__ == "__main__":
 #debug
 sys.argv.append("Moje")
 sys.argv.append("newsletter@example.cz")
 sys.argv.append("subscriber@example.com")
 sys.argv.append("may2011.template")
 sys.argv.append("This is subject")
 sys.argv.append("This is date")
 
 if len(sys.argv)!= 7:
 exit(-2)
 firm = sys.argv[1]
 fromEmail = sys.argv[2]
 to = sys.argv[3]
 template = sys.argv[4]
 subject = sys.argv[5]
 date = sys.argv[6]
 
 exit(sendmail(firm, fromEmail, to, template, subject, date))

Producción

Traceback (most recent call last):
 File "C:\Documents and Settings\Administrator\Plocha\Newsletter-build-desktop\sendmail.py", line 69, in <module>
 exit(sendmail(firm, fromEmail, to, template, subject, date)) 
 File "C:\Documents and Settings\Administrator\Plocha\Newsletter-build-desktop\sendmail.py", line 45, in sendmail
 raise ex
 File "C:\Documents and Settings\Administrator\Plocha\Newsletter-build-desktop\sendmail.py", line 39, in sendmail
 server.sendmail(fromEmail, [to], msg.as_string())
 File "C:\Python32\lib\smtplib.py", line 716, in sendmail
 msg = _fix_eols(msg).encode('ascii')
UnicodeEncodeError: 'ascii' codec can't encode character '\u011b' in position 385: ordinal not in range(128)

Solución del problema

La pregunta de Martin Drlík tiene 7 años y 8 meses... Y hoy en día, gracias a los desarrolladores de Python, los problemas de codificación se solucionan con la versión 3 de Python.

En consecuencia, ya no es necesario especificar que se debe usar la codificación utf-8:

#!/usr/bin/python2
# -*- encoding: utf-8 -*-
...
 part2 = MIMEText(text, "plain", "utf-8")

Simplemente escribiremos:

#!/usr/bin/python3
...
 part2 = MIMEText(text, "plain")

Consecuencia final: ¡el guión de Martin Drlík funciona perfectamente bien!

Sin embargo, sería mejor usar el módulo email.parser, como se sugiere en email: Examples.