DFL 1600 problem

HI,
I have a problem with my new firewall dlink dfl-1600

I have lan1, wan1, wan2 and dmz (webserver).

when i send an email from a webpage using cdonts.dll from lan1, I have no
problem,.

when I try to send an email from webserver on dmz, this one don't run.

In the logs I can see the port and the connection open but the email don't
arrive.

Do someone have configured this service on dlink?

thanks


.