import smtplib
import os
from email import encoders
from email.mime.text import MIMEText
from email.mime.image import MIMEImage
from email.mime.multipart import MIMEMultipart
from email.mime.base import MIMEBase

filename = "test.txt"
msg = MIMEMultipart()
msg['Subject'] = 'From ТЕСТ' # Тема: (имя пользователя компьютера)
msg['From'] = "MAIL" # От: (отправителя)
msg['To'] = "MAIL" # Кому: (отправителю)

part = MIMEBase("application", "octet-stream")
part.set_payload(open(filename, "rb").read())
encoders.encode_base64(part)
part.add_header('Content-Disposition', "attachment; filename= %s" % os.path.basename(filename))

s = smtplib.SMTP('smtp.mail.ru', 587)
s.ehlo()
s.starttls()
s.ehlo()
s.login("MAIL", "PASSWORD")
s.sendmail("MAIL", "MAIL", msg.as_string())
s.quit()