Thank you gmayor for your reply. Yes, you are correct that most ISP providers have alternate port settings and I have utilized many of them on my other email accounts (I have around 8 or 9 configured into Microsoft Outlook) but for this particular account, I have never found a way to "send" from it unless I was physically attached to the ISP not even port 587. Unfortunately that is the email account I mistakenly used to send an email from and it kept trying to send and also disappeared from the outbox. The other link you provided refers to deleting an email when you can actually see it in the outbox which I had always been able to do in the past.

What I finally decided trying was to simply delete that email account and then re-install the email account and that did fix the problem. By deleting the account - apparently the invisible email got deleted as well. That account is now working just fine again so now I know what to do if it happens again. I appreciate your help.