No, the message is actually truncated. I did file>save to a file in the email client and looked at the actual message as received over SMTP.
Sending whole paragraphs as single long lines is really not a good thing. Somewhere along the line, bad things can happen, as apparently did in this case. If I remember right, SMTP only guarantees lines up to 1024 characters won't get truncated. Paragraphs, however, can be arbitrarily long.