After 3 hours fumbling around, I was able to find the answer to my problem:
Despite my email working fine with the settings above on my old Samsung Vibrant, I found the following new settings that worked 1st try on the ATT.net support site:
How my old phone was able to work using different...anyones guess. Hpefully, my 3 hours spent will save another user time. FYI, HTC One S....AWESOME.