Sending email through ISA Server 2000

Hi there!!!,

I have configure the ISA server 2000 to work with Lotus Notes 6.5.1 to receive and send emails, but the problem I have is that I can receive emails very well from the outside world, but when I try to send an email our mail server give us this error message:

ROUTER: Failed to connect to SMTP host.

Can someone please help me with this?.