Recently, all of the sudden our systems were running extremely slow, and email wasn't being sent out. It was discovered that our SBS 2003 server had been somehow switched to an open relay! I quickly went and mad the necessary changes in the ESM to get it back, but our systems are still running slow and there are messages still appearing in the SMTP queue. Is it possible that I have to restart my server for these changes to take effect or am I just receiving the residual mail that was being relayed?
Any help is appreciated.