Email recipients unable to open pdf attachment
I am using OS 10.6 (diff version on diff machines) & Filemaker 11.0.2
We send out emailing regularly with a pdf attachment. Most of our clients receive the email just fine but a few (around 10% of what we send out) are unable to open the attachement. I am trying to discern if this is a filemaker issue or something else. So, first, what could be causing this on the Filemaker end and secondly, how do I determine if is their email client causing the problem (particularly if they can open other attachments just fine)?