crispray, I am glad to hear that your issue has been resolved. Please let us know if we can help you with any other issue.

I want to thank your for your help on this issue. I am running Outlook on Windows XP and did a google search of the issue. Your solution focused me in on the problem and solved it much more quickly than would have otherwise been possible. I ran scanpst.ext to clean up my pst files and then re-entered and saved email addresses for each contact whenever my sending would not work. Sometimes the email addresses look fine in the contacts folder, but they need to be re-entered and saved for some database somewhere to know they are there. Once I do that, everything is OK and life is good!