I have been using my Outlook account on Thunderbird to receive and send emails for a long time without issue. I am now not able to send ANY emails without them getting bounced back with the error message... "The mail client submitted this message with bare line feeds, which cannot be sent via SMTP protocol DATA command and receiving system does not support BDAT." I have not changed any settings and have talked with Microsoft support and they have said it is a Thunderbird thing. So here I am reaching out for help. I am also aware of another person using the same set up that this is now happening to. Any ideas? CRAIG