Roadrunner doesn't allow SMTP from an outside network to "send" through their network....
I have to question the accuracy of that...I have a roadrunner email on my Droid, and have no problem sending nor receiving email on it..after reading the above I did a test, and it went out and was received with no problem...
Perhaps the threadstarter does not have his/her outgoing port set properly, as roadrunner is one of the emails that needs additional info in the settings to work on a Droid, unlike a hotmail, gmail, or many of the other pop3 emails that simply require you to enter the email address and password during setup.
To further screw things up, if I am not mistaken, with roadrunner, the ports, incoming, and outgoing server info can differ depending on what part of the country you are in.
For me here in Southern California, the server settings are as follows:
Incoming Server Settings -
Username: the full email address, including the @ bah blah blah
password:
POP3 server: pop-server.roadrunner.com
Port: 110
Security type: None
Outgoing Server Settings -
SMTP Server: smtp-server.roadrunner.com
Port: 587
Require sign in: is 'checked'
Username: is again the full email address