Unable to Send Email, but can receive it.
I have an ISA 2006 as our proxy. I've published our Exchange 2003 server and we are able to receive all outbound email. We can also send/receive all internal email. But we can't send email to the internet.
To check if DNS is working on my end I've done the following.
Checked the DNS forwarding on my dns server and it also has my ISP DNS ip there. We can access the internet from any location (checking dns again) Also able to ping all servers by machine name, not just by ip. Flushed the Arp on a server and pinged by name again, just to be sure.
I've contacted our ISP, he says everything looks good on their end.
Baffled and a receiving a few calls about the email bounce backs. Any suggestions would be welcome.