test channel mails not going out

hi,

i've created mailforms in the CRMD_EMAIL, then i wanted to test the e-mail if they will be sent out. So i maintained :-

1) Sender e-mails address

2) Recipient e-mail address

after i click on the "Enter" to send the e-mails out, i get the following error message "No delivery to someone@gmail.com, as recipient unknown".

Did i miss out any steps? eg. configure stmp, etc??