Thunderbird sends RTF attachments as text/rtf. Some other mail clients have
problems with this. Mutt, for instance, marks RTF attachments as
application/rtf.

I don't know if this is related to /etc/mime.types or a problem within the
code.

Related to this bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=213393

Niklas Vainio wrote:
You appear still to be running thunderbird 0.5-4. 0.8-x is already
available in sarge. Please give it a try to see if the behaviour has changed

Hi, and thanks for the prompt reply,

I updated. Behaviour hasn't changed.

If you already received this message, because you had an important
bug open, just ignore it.
<<<<<

Hi,

you receive this mail because you submitted a bug report
to the mozilla-thunderbird package.

If you already received this message, because you had an important
bug open, just ignore it.

Mozilla Thunderbird is quiet popular and thus has lots of bugs open.
Verifying one by one with each release on my own would be a really
hard task, so I heavily depend on the testing and quality feedback
of the package users.

As you might have noticed Thunderbird 0.9 has been released about a
week ago. Finally I have uploaded a package for that version to my
preview and backports repository. The apt lines can be found at [1].

In addition to testing the upgrade path I ask you for help to verify
if your bug is still present. So please take a minute or two and
install the preview package to look if everything is fine and if your
bug is still present. The preview package is currently build for
sarge, so if you encounter any problems installing them in unstable,
let me know! I might build another version for the current sid too!

And remember, please drop a note to your bug report mentioning the
outcome of your test.

Note: If you encounter any new bugs or upgrade bugs in the new
package, please don't post them to the debian BTS by now, since I
will try to fix as many as possible before I upload it to the debian
archives. Just send them to me with the subject line starting with
'[previewbug]'.

Thanks for all your help testing and improving and actually caring
for this package.

Cheers,

Alexander

[1] http://www.jwsdot.com/debian/install.html

severity 273804 minor
forwarded 273804 https://bugzilla.mozilla.org/show_bug.cgi?id=213393
thanks

I think, as long as this is not illegal and still correct for mime, this is no
big problem. Nevertheless, keeping this open and adding upstream hint.