Cannot send attachments to Lotus Notes from Outlook 2003

We have an Exchange 2003 environment (on Server 2003) running Outlook 2003 as our mail client.  Some users (at our site), are trying to send email messages to customers that are using Lotus Notes, if there is an attachment sent, it is stripped off at the Lotus Notes side.  Some of our users at our site can send attachments to this specific customer and some can't.  We have tried sending strait text messages (not HTML or Rich Text) but that doesn't work with some users.  When our customer replies back to us to say they did not get an attachment, there is a "c.dat" file attached with their message.  I'm not sure if this is an issue with Outlook or an issue with Lotus Notes...I would be happy to fix either one!
tonykmanAsked:
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ECNSSMTConnect With a Mentor Commented:
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ECNSSMTCommented:
attachments should be going thru with no issue; unless the Lotus Notes guys have some sort of anti-spam, anti-virus scanner at there end that is stripping them.  I'm kinda surprised you didn't mention anything about a winmail.dat file.

I suspect its the Lotus Notes side.  If you want to test you can use a generic email service (Yahoo, Gmail, etc) and attempt to send the same files.  That will be at least a clarification that it is not Outlook related; if the same issue occurs.

Regards,
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ECNSSMTCommented:
Oh, it would be interesting if you can run something that decodes MIME on that c.dat file.  Just in case the c.dat file contains the encoded attachments.  

Another thought is that the Lotus Notes install may not be able to read  the encoded attachments and just left everything in the c.dat file.  If that is the case; if you opem up the C.dat file with any text editor, you should see some information pertaining to the attachments; the attachment names may be the word BEGIN, the rows of alphanumeric characters, then END.  If so; then the attachments did arrive at the destination, but was not successfully decoded back to their original state.

Regards,
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tonykmanAuthor Commented:
That makes sense.  I looked at the c.dat file and it did contain (from what I could read), the information that was originally sent.  I suspect it is on the lotus notes side as well but I wanted another opinion.  When we send from gmail everything goes through as well.  
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ECNSSMTCommented:
Just to clarify, from GMAIL you get the same c.dat file right?
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tonykmanAuthor Commented:
No.
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ECNSSMTCommented:
Darn, that just about brings it one step back into MS's court...
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