For about a month now Thunderbird has been taking sent emails and doing one of several things. 1. Replacing the text with lines and lines of numbers and letters, 2. Removing the "From" and "Subject" lines and the message, leaving the message blank, BUT adding an attachment that has nothing to do with the recipient; 3. Sending some sent messages to trash after I have tagged them. I use emails like a paper trail, to check, to see if there are any emails I am still waiting to hear an answer back on, etc. Thunderbird has been my favorite email client since I was first told about it. Please help. Thank you, Lisa Icenogle