RHEL6 mail attachment with uuencode won't work anymore

The old trick of sending out attachement with
uuencode /tmp/myfile myfile | mail -s "Attachemnt" user1@xyz.nowhere
won't work any more after migrated to RHEL6. All the uuencoded message will display as body contents rather than an attachment.

If you have a script like above, for sure you will get impacted:
http://www.linuxquestions.org/questions/linux-newbie-8/uuencode-issue-with-rhel-6-3-a-4175450188/

Redhat seems to have some kind of workaround but it only opens to its registered users.
https://access.redhat.com/site/solutions/104833

The fix is pretty simply but you'll still need to make changes to your so-far-working-well scripts.
mail -a /tmp/myfile -s "Attachement" user1@xyz.nowhere.

The problem seems coming from the headers the new version introduced.
something like:
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit

Old version headers just have:

MIME-Version: 1.0

There might be options to disable the new headers, let me know if anybody find them out.