Python spammer with unicode support

pyspammer.py

#!/usr/bin/env python3
# encoding: utf-8

import smtplib
from email.message import Message
from email.header import Header
from email.utils import formataddr

SMTP_SERVER = 'mail.suomi.net'
FROM_NAME = 'Example Sender'
FROM_EMAIL = 'from@example.com'
TOADDRS = [('Example Receiver', 'to@example.com')]
TEXT = "Tässäpä on pitkä tekstiviesti.\nÄäkköset ja €-merkit eivät ole ongelma."
SUBJECT = "Tämä on taas kerran testiviesti"

def main():
    from_header = "{} <{}>".format(Header(FROM_NAME), FROM_EMAIL)
    subject = Header(SUBJECT, 'utf-8')
    server = smtplib.SMTP(SMTP_SERVER)
    server.set_debuglevel(1)
    for to_name, to_email in TOADDRS:
        msg = Message()
        msg['Subject'] = subject
        msg['From'] = from_header
        msg['To'] = "{} <{}>".format(Header(to_name), to_email)
        msg.set_payload(TEXT, 'utf-8')
        server.sendmail(FROM_EMAIL, to_email, msg.as_string())
    server.quit()

if __name__ == '__main__':
    main()

Does not validate to_email, which may be bad if the email source is untrusted