read mails with smartermail webservices

I'm trying to read my mailbox with the smartermail webservices.
When I'm trying to connect I get "permission denied" with the email adres as username, or "login failed" with postmaster als username

svcServerAdmin admin = new svcServerAdmin();
GatewayListResult gwlr = admin.ListGateways("[email protected]", "XXXXXXXX");

When I'm not using the webservices

POP3Client pop = new POP3Client();
pop.Open("http://pop3.philosite.net", 25, "postmaster", "XXXXXXXX");
I get a problem with DNS "The requested name is valid, but
no data of the requested type was found"

Is there a way to resolve these problems? I'm trying to connect from a local IIS project.