MIMEText UTF-8 encode problems when sending email

Question

Here is a part of my code which sends an email:

servidor = smtplib.SMTP()
servidor.connect(HOST, PORT)
servidor.login(user, usenha)
assunto = str(self.lineEd         


        

Answer 1

It seems that, in python3, a Header object is needed to encode a Subject as 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()))

Output:

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

So the original script would become:

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())