[other_os] requirements for sendmail to actually sendmail

view story

http://ubuntuforums.org – well here it is, im running raspbian on a raspberry pi, i have Apache2 set up and hosting a website from the Pi, aparturecreations.com, i have citadel installed and set up, and i can recieve email at the email support(at)aparturecreations.com, but i am unable to send mail. When trying to send mail, i get the following error message back ******@gmail.com : DNS server returned answer with no data What do i have to do in order to be able to send outgoing mail. (Hardware)