I can get the smtp server address from an email address by using DnsQuery() function.But I wonder wether I can get the pop3 server address or not. If u can, tell me how. Thanks.

Really? Sorry, i have tried a lot. But it isn't improved. I am locked by the it. Can u tell the detail of the key ?

I am writting a C/S program based by Socket and IO completion. I use CreateIoCompletionPort and GetQueuedCompletionStatus to build and get the connected socket. The Server program goes well when it is built. I also built a client for testing server.But a problem comes. If I use one client to connect the server, everything is fine. IF I use two more client to connect the server at the same time, the server handle them one by one.It doesn't handle them synchronously as I expected. Does anyone know the reason. Anyone is so kind to replay me? Thanks. aaa