I am using IIS 6 Default SMTP Virtual Server to relay message from the local computer. I use to be able to send out through IIS but recently it has stopped sending and all of my messages just get stuck in the queue. I have made sure that my firewall is allowing for SMTP to go out from port 25. I have also tried removing all the emails from the queue and tried to send just one thinking that maybe one of the emails in the queue was blocking the rest but still no luck. Does anyone have an idea of what else I can check or why this might of just stop working?