This is how I do it....
I also have an sbcglobal.net email address (among others) which I prefer to use as my "send from" email...
In other words when I send an email I like it to appear as if I sent it from my sbcglobal address.
I configured my gmail account to send all my emails with my sbcglobal address. I believe this is under settings/accounts on gmail.
For all of my incoming emails for my yahoo and sbcglobal email accounts, I simply logged in to my yahoo account and set it to forward all of my emails to my gmail account.
When I set up gmail on the droid, everything shows up. It has been a very reliable setup for me.