Description of problem:
Thunderbird doesn't seem to offer an option to chose the type of encoding attachments.
E.g. thunderbird seems always base64 encode '*diff' attachment.
This practice is frowned upon in developer mailing lists, because it renders reading *.diff's hard.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Attach a *.diff to a mail
2. send it to yourself.
3. Check the mail's source
Sent mail contains a base64 encoded attachment:
User to select type of attachment.
base64 encoded attachments are frowned upon on all gnu lists.
Provided the fact gnu lists are one of my primary use cases, this defect in thunderbird forces me to stop using thunderbird.
We filed this bug in the upstream database (https://bugzilla.mozilla.org/show_bug.cgi?id=520702) and believe that it is more appropriate to let it be resolved upstream.
We will continue to track the issue in the centralized upstream bug tracker, and will review any bug fixes that become available for consideration in future updates.
Thank you for the bug report.