Hello,
Please help, basically we have the same issue as the following post, only the proposed answer is not the final answer and the issue persists:
Environment:
Windows Server 2012 DC edition
Exchange 2013 Std edition
Outlook 2013 (Office 2013 Std edition)
No Malware protection enabled within Exchange 2013
No Antivirus application on Windows Server
Issue:
Same problem experienced with two separate installations, random e-mails are stuck in the Exchange Submission Queue with Delivery Type Undefined and retry error "A storage transient failure has occurred during content conversion."
Workaround:
Running the following command will clear the queue but causes adverse effects:
Get-RemoteDomain|Set-RemoteDomain-TNEFEnabled $true
Would be great if Microsoft could help out here, we are sort of stretching relationships with our customers..
Regards,
Lyndon.