IPCop and MS Outlook 2003 settings

Hello,

I am very new to redhat. I have used Ipcop 1.4.x for filtering and controling internet usage. Now i have installed Ipcop 1.4.18, configured the Red and Green. I do not wanted to use Orange/Blue etc.. as of now.

I am able to get most of the features. However, MS Outloot 2003 users are not able to send/receive mails. Mail server is outside my domain. We have POP3(110) and SMTP(25) ports enabled. If remove IPCop Firewall Outlook will start woking fine.

Still it is not able to connect to the server. Can anybody help me how to resolve this issue.

Thanks in advance.

Jaimon