that looks like send connector
i would prefer to buy a third party send connector .check out www.dyn-dns.com
there you can add your out going email server (domain) and then you have to create a send connector and by selecting custom and defining the informations given by dyn-dns to you will really help you out .
or if you dont want to do this can you please send me a Screen shot of your send and recieve connector
and check the event logs also if you find out some thing …