메일보낼려면 하면 에러나요!!!

메일을 보낼려고 하는데 아래와 같은 에러메세지가 나옵니다.

도와주세요!~

Insufficient disk space; try again later
/root/.forward: line 1: forwarding to webmaster@ewalwal.com
Insufficient disk space; try again later
returntosender: cannot select queue for root
postmaster... aliased to root
/root/.forward: line 1: forwarding to webmaster@ewalwal.com
Insufficient disk space; try again later
returntosender: cannot select queue for postmaster
savemail: cannot save rejected email anywhere

급하거든요!!