After four years of this sbs2003 server having no problems we started getting really slow internet yesterday. throuhg a lot of trial and error I have narrowed the issue down to the smtp virtual server service on our sbs 2003 machine. With the service running pings to google have a time of around 4000, turn the service off and it goes back to a healthy 20.
The server has anti-virus, anti-spam and anti-malware software running on it, I have run all the scans and they come up clean. Can anyone give me a clue why this is happening and what I should do to solve it?
PS the problem still occurs if the server is the only think attached to the router, so I'm assuiming the issue is on the server, not any client machines.