donut1950,
Would you provide more information about your problem so that we can troubleshoot?
What is the version of your Adobe Reader for Android?
What is the version of Android OS?
What is the mail app do you use to read email on Android?
When you try to open an PDF attachment, do you see the dialog "Compete action using" with the Adobe Reader icon? Does the dialog have "Always" and "Just Once"?
Could you tell us the exact error message that you see when you try to open an PDF attachment?
Does the problem happen with ONE particular PDF attachment? Or does it happen with any PDF attachments all the time?