Setting Return-Path with Python sendmail for a MIME message

Question

Hi would like to set the \"Return-Path\" header for a MIME message I send with Python. Basically, I tried something like this :

message = MIMEMultipart()
mes         


        

Answer 1

Return-Path is set by the SMTP protocol, it's not derived from the message itself. It'll be the Envelope From address is most setups.

The proper way to accomplish this is:

msg = email.message_from_string('\n'.join([
    'To: michael@mydomain.com',
    'From: michael@mydomain.com',
    'Subject: test email',
    '',
    'Just testing'
]))
smtp = smtplib.SMTP()
smtp.connect()
smtp.sendmail('something@something.com', 'michael@mydomain.com', msg.as_string())