User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0 When sending UNIX text files (lines ending with \n) as attachment, Thunderbird rewrites end of lines (now lines end with \r\n). As a result, the recipent cannot uses those files (mostly scripts) on UNIX servers without filtering all those ^M. Outlook handles those files correctly. Reproducible: Always Steps to Reproduce: 1. Attach an UNIX text file to a mail 2. Check the text file the recipient received 3. Actual Results: The text files contains ^M. Expected Results: I cannot understand why Thunderbird modifies attachment files. All attachment files, including text files, should be considered as binary files and not modified.

*** This bug has been marked as a duplicate of 161806 ***