I've noticed this forum has only problems posted, never solutions. Well, in the hopes of starting a trend, here's how I solved the above. In email settings for the smtp mail host, I entered port address 587 after the smtp address as is in "smtp:sbcglobal.yahoo.com:587". Stumbled upon an ATT site that listed that port as one to use, where as the majority of their instructions for configuring email tell you to use 465.