Ms Outlook probleme

[atlas]

hello

i have a little probleme whit IPSconfig .

i can send and receive mail whit the webmail no probleme it work well i can send email to other domaine > free.fr - wanadoo.fr and other ....

i use outlook for read my email .
i have create an pop3 account and write my logging and password .
when account created whit outlook i try the message test and it work he send one mail to my email .

my problem is when i would send an e-mail to other domain whit outlook (free.fr or wanadoo.fr ) i have this message :

554 <zibann@free.fr>: Relay access denied

i dont know why cause whit the webmail it work fine ?