发送电子邮件时的 MIMEText UTF-8 编码问题

Question

这是我发送电子邮件的代码的一部分：

servidor = smtplib.SMTP()
servidor.connect(HOST, PORT)
servidor.login(user, usenha)
assunto = str(self.lineEdit.text())
para = str(globe_email)             
texto = self.textEdit.toPlainText()
textos = str(texto)
corpo = MIMEText(textos.encode('utf-8'), _charset='utf-8')
corpo['From'] = user
corpo['To'] = para
corpo['Subject'] = assunto
servidor.sendmail(user, [para], corpo.as_string())

除了主题部分之外，一切都很好。 当我尝试发送带有特殊字符（例如“ação”）的字符串时，它会引发此错误：

UnicodeEncodeError: 'ascii' codec can't encode characters in position 1-2: ordinal not in range(128)

如何在 MIMEText 的主题中发送带有特殊字符的电子邮件？

Answer 1

似乎在python3中，需要一个Header对象来将Subject编码为utf-8：

# -*- coding: utf-8 -*-
from email.mime.text import MIMEText
from email.header import Header
s = 'ação'
m = MIMEText(s, 'plain', 'utf-8')
m['Subject'] = Header(s, 'utf-8')
print(repr(m.as_string()))

输出：

'Content-Type: text/plain; charset="utf-8"\nMIME-Version: 1.0\nContent-Transfer-Encoding: base64\nSubject: =?utf-8?b?YcOnw6Nv?=\n\nYcOnw6Nv\n

所以原来的脚本会变成：

servidor = smtplib.SMTP()
servidor.connect(HOST, PORT)
servidor.login(user, usenha)
assunto = str(self.lineEdit.text())
para = str(globe_email)             
texto = str(self.textEdit.toPlainText())
corpo = MIMEText(texto, 'plain', 'utf-8')
corpo['From'] = user
corpo['To'] = para
corpo['Subject'] = Header(assunto, 'utf-8')
servidor.sendmail(user, [para], corpo.as_string())

Answer 2

我已经改进了与服务器连接和登录的其他方式的答案，因为另一种方式我在验证应用程序时遇到了问题，人们可以看到所有应该使用的库

from email.mime.text import MIMEText
from email.header import Header
import smtplib

user='email1@teste.com'
pwd='password'
server = smtplib.SMTP('smtp.office365.com', 587) #it works with outlook
server.ehlo()
server.starttls()
server.login(user, pwd)
assunto = 'Teste'
para = 'email2@teste.com'
texto = 'Niterói é uma cidade incrível '
corpo = MIMEText(texto, 'plain', 'utf-8')
corpo['From'] = user
corpo['To'] = para
corpo['Subject'] = Header(assunto, 'utf-8')
try:
    server.sendmail(user, [para], corpo.as_string())
    print('email was sent')
except:
    print('error')
server.quit()