Mail.app not decoding MIME attachments correctly

I have a security camera that e-mails me a video clip whenever a security event happens.   I have these events e-mailed to a linux server to a private e-mail account. From time to time, I use Mail.app on my Mac to review the video clips by opening the attachments with MPlayerX. Until I upgraded to Yosemite, all this worked flawlessly.
The issue is that with Yosemite, about half of the e-mailed video clips are being received corrupted and unplayable.   I'm certain that it has something to do with the MIME decoding of the attachment that appears to have changed in Yosemite.   If I click on the e-mail attachment directly, and select "Save Attachment..." to save it to a file, the file will be corrupt and unplayable.   But, If I view the e-mail raw source, extract out the base 64 encoding and then decode it manually with openssl's base64 command the file is never corrupt and always correct.
I have Maildrop disabled in the account properties and do not use iCloud at all.
Has anybody else had issues with e-mail attachment decoding on Yosemite? Any possible workaround other then downgrading back to Mavericks?   Is this a known issue that is going to be fixed very soon since I'm assuming a lot of people will be hitting this.
Thanks.

Quit Mail first and using the Finder go to Home > Library > Mail. Copy the Mail folder and place the copy on the Desktop for backup purposes.
Using the Finder go to Home > Library > Mail > Envelope Index.
Delete the Envelope Index file and empty the Trash.
Launch Mail and you will be prompted to import mailboxes. Select OK and allow this process to complete. This really isn't importing anything but replacing the deleted Envelope Index file and re-indexing all mailboxes and messages.
I'm not sure this will make any difference either but can't hurt.
After confirming all mailboxes/messages are available, you can delete the copy of the Mail folder from the Desktop.
When was the last time you use a system and user cache cleaner?
Check this link for system troubleshooting procedures and when doing so, follow all steps/instructions in the order provided.
http://www.thexlab.com/faqs/repairprocess.html

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Yosemite Mail.app doesn't MIME decode certain mail attachments

My CCTV system sends short e-mails with 4 lines of text and a .JPG attachment.
These e-mails can be read fine on Mavericks and iOS 8, but not on Yosemite:
On Yosemite OS X 10.10 (14A389) Mail Version 8.0 (1990.1) the attachment is still MIME/base64 encoded (and therefore doesn't open as a JPG picture).
If I save the attached non-working ".jpg" file and the copy/paste the content to something like http://tomeko.net/online_tools/base64.php?lang=en , the hex data of the correct image file is decoded. But of course, I want Mail to do that for me...
This happens with mails when received from the IMAP server as well as with mails that were received a year ago and stored in a local folder (and of course worked fine a year ago with the Mac OS X version at that time).
Filed as rdar://18701360
Cheers
mh

Note that the line break before "boundary=——part1——" after the base64 encoded attachment ist missing, so that the problematic e-mails are technically not 100% RFC 1341 compliant.
However, no other e-mail client I have tested has a problem with this, including the Mail app that came with Mavericks, so I would really expect that Apple should not degrade the compatibility with slightly-off e-mails from 10.9 to 10.10.
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Since upgrading to OS X 10.5, mail.app intermittently doesn't fully recognize attachments. The mail.app *Message Viewer* window correctly lists the email subject and the no. of attachments. But viewing the message shows no attachment, nor is there any 'save attachment' button.
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My workaround for now is to highlight the message in the Message Viewer window and then select File -> *Save Attachments...* But it's highly inconvenient. Right-mousing on the message in the Message Viewer window does not offer the "Save Attachments..." menu item.
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Message was edited by: DoomedTX (added S/MIME to title)

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Mail.app not decoding MIME attachments correctly

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