Good input, thanks.
The mail carrier came. I'm ok with the initial bark. Saying "quiet" did nothing but i was able to reinforce what quiet is by feeding them chicken breast pieces while the mail carrier was at the door.
That being said, we just had a horrendous barking walk and i couldn't control them.
We were doing ok until a truck passed us very closely. The 2 of them barked wildly and didn't care I was there. I'll just keep working at it. I imagine this will take a few weeks if not longer.