Hi guys,
I've looked around the forums and have found people that have had submission queue issues when they set TNEF to $null or $false, and have found that the unified answer is to set TNEF to $true.
I also see folks having issues with recipients in remote domains receiving winmail.dat files in some instances (with a .pdf or .xls file attached) if TNEF is set to $true.
I have both issues. If I set TNEF to $true, I encounter the winmail.dat file problem. If I set TNEF to $false or $null, I encounter the submission queue issue (submission queue states "A transient storage failure occured", and users get a queue expiration bounce). Neither of these states are acceptable. I cannot have messages stuck in the queue only to be expired, and I cannot have recipients in remote domains failing to receive attachments in emails.
Does anyone have a possible workaround that might resolve this particular situation? It seems that this has been an issue in Exch 2010.
Current Environment Configuration:
I am running Exchange 2013 SP1 Standard on both of my CAS/MBX servers, running on Server 2012 R2 patched to the latest updates. I have an inbound spam filter, but mail outbound is not filtered, therefore the spam filter on our side should not play a role. I do have not made any changes to the exchange default malware filter either. Other than this issue, mail is flowing correctly and as expected.
