Iis SMTP relay Content-encoding

I am using IIS 6 SMTP Virtual Server to relay messages from our internal network to Exchange Online. This is working correctly except for one minor problem.
When using Task Scheduler to send an email with attachment (using the built in send email function), the attachment cannot be opened. When attempting to open an excel file (.xlsx, or .xlsm) sent by a scheduled task, Excel states "The file is corrupted
and cannot be opened", or "Excel found unreadable content in <filename.xlsm>". 
By monitoring the SMTP queue folder, I can see the Content-Transfer-Encoding is set to base64 for emails with attachments sent by our other automated systems. However, excel files sent by Task Scheduler are
incorrectly set to 8 bit instead. This only seems to happen with Excel files. Files with .pdf or .docx extensions can be opened after being emailed
by Task Scheduler.
My best guess is that this is a failing of the SMTP relay. Is there some way this can be configured to encode Excel attachments as base 64?

I would recommend asking them here: http://forums.iis.net/
This posting is provided AS IS with no warranties or guarantees , and confers no rights.
Ahmed MALEK
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