X-QORK...this is already a major step towards a solution. Next step, send the mail with these attachments to a hotmail, yahoo or whatever account you have (pprune will not work
) and see if the attachments arrive there.
I am very convinced now that they do arrive.
This means in simple termes that the problem IS NOT AT YOUR END!
I don't know what your recipients use or filter, but it is at there end.
You can actually try and send a testmail to me at
[email protected] with a word attachment or whatever (don't worry, viruses have no chance here). I will let you know immediately.