Is it possible to send a MIME message as it is, without adding any headers? For example, if I have a correct MIME message with all headers and content saved to a text file, is it possible to use the contents of this file without modification and send it via SMTP?
Apparently both python's SMTP.sendmail and PHP smtp::mail require at least "To:" and "From:", and passing the complete message to these functions doesn't seem to work.
You could read up to the first blank line, use those as additional headers, then send the rest in the body.
Sending a MIME email prepared beforehand (in PHP or Python)