I'm running Python 2.5.2 under Ubuntu 8.10.

In the file email/generator.py from the core library at line 228 in the
function _handle_multipart()
            # delimiter transport-padding CRLF
            print >> self._fp, '\n--' + boundary
but if this function is run under Unix it print only the LF and not the
CRLF as by required by the standard. 

My guess is that this error is also in other part of the library.
SMTP (as HTTP) requires CRLF as new line, by standard, while I see that
at the beginning of the generator.py
NL = '\n'

Am I missing something?

Luca

I forgot to say that the 
\n
should be substitute with 
\r\n
CRLF

Luca

Effectively this is a duplicate of issue 1349106, since you are right that it affects more than just boundary production. I believe we are going to address this in a new version of the email module.