Mountain Lion mails with attachments on exchange get lost

Dear Community,
we encounter a real annoying and weird issue with CS6 on our Macintoshs using Mountain Lion 10.8.2.
It all started, that mails with attachments (e.g. JPGS, PDFS...) just get lost and do not arrive. Not all mails but some, spontaneously. But always the same files were affected. Some work, some not.
Our company is using Exchange, and there is no message back to the sender, that the mail did not arrive. You can even see it on sent items and it occurs in Outlook 2011 as well as Apple Mail. I contacted our IT and they checked the Exchange logs and everything is fine, like the mail would have arrived, bit it does not.
We went crazy and tried almost everything, clean OS installs, new users... the funny thing: when you forward the mail out of "sent items" it arrives...
Today a milestone appeared while troubleshooting this issue: We realized, that only files saved from Photoshop, Indesign, Illustrator (basically CS6) are affected. When I save a PSD as a JPEG out of Photoshop and mail it as an attachement it gets lost. Always. Same for PDFs or other file formats out of CS6.. When I open a PSD on embedded Mac Viewer and export as JPEG or PDF it does arrive the sender. So it only happens when saving the files out of CS6.
So now, I have no clue how to proceed. Is anybody else having this issue or can help us? It is a mess, because it turns our daily work to a horror.
Any help is appreciated solving this weird issue. Thank you so much.

Hi ,
You can try setting the below value to false and see the results too since its exceeding the recipient thread limit could be a problem with the throttling as well.
<add key="MailboxDeliveryThrottlingEnabled" value="False" />
Restart the transport services after the change and see the results.
Good Luck :)
Remember to mark as helpful if you find my contribution useful or as an answer if it does answer your question.That will encourage me - and others - to take time out to help you Check out my latest blog posts on http://exchangequery.com
Hello, thanks for the try,
tried the change in edgetransport.exe.config. Restartet the 4 transport services (Transportdelivery,transportsubmission, transport and transport logsearch) No change though. Problem still exists. May this go into msexchangethrotteling.exe.config?
Regards
Michael

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Mountain Lion mails with attachments on exchange get lost

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