I have finally had success in sending my attachment. I had changed my email
options previously to plain text (default was HTML) but some recipients still
did not receive the attachment. The solution for me which I found elsewhere
in this forum: In the contact folder, I double clicked on my recipients
email address. That brought up an e-mail properties dialogue box. I changed
the internet format to "send Plain Text only" (default was Let Outlook
Decide) for the recipients that did not receive my attachment and that
worked. I had to change each contact individually but what a relief to
finally accomplish sending an attachment!