I am getting an error while trying to retrieve my mail from ###.com. I
am using the pass word given to me "#####" The pass word dosn't
Your domain transfer is not fully propagated yet - this is why it won't work. Since your domain still points at your old server, that old server does not recognise you when you try to login with your new username and password (this username and password are for your account on our servers)
Domain transfers take between 24-48 hours to propagate fully. The whois information is updated immediately, but propagation takes longer.