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SMTP Service Causing High Internet Usage

Customer is complaining that the Internet is very slow. After some troubleshooting, I have determined that SMTP is causing the issue. The server is an SBS2003 running Exchange. When pinging with the SMTP service started, the reply is 3000-4000ms. When stoping the SMTP service, the ping reply drops down to a reasonable 20-40ms. I checked the queue in System Manager but it is empty. Any ideas?

greenbug2002

is the SMTP Service actualy passing any traffic out the internet connection or is it slowing a proxy used for internet access by usisng CPU and memory if its the first option i would put a sniffer on the connection and see what is being sent second option try re-service packing exchange

ptsolutionsinc

ASKER

we dont have a proxy and and CPU usage is normal. how do i put a sniffer on the connection?

MegaNuk3

It may be receiving a large message/s and you won't see that in the queue.

What are the message size limits? Hopefully 5Mb max 20Mb...

You can turn on SMTP protocol logging to see what is happening, but I would recommend setting message size limits if you have none.

ptsolutionsinc

ASKER

I have checked the message size limits and they were set to unlimited. i changed to 20MB but the issue continues. I followed Microsoft's Knowledgebase to enable SMTP protocol logging and MSExchangeTransport is already set to Maximum but the knowledgebase does not show how to access the logging. where do I go to check this?

MegaNuk3

Should be under c:\windows\logfiles

Did you restart SMTP after setting the size limits?

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MegaNuk3

Thanks for the final solution, feel free to close the question.

ptsolutionsinc

ASKER

I researched other Experts-Exchange posts and found a post that helped me resolve the problem. Not sure if there is a way to link this post to that post but the post is below. The accepted solution is what helped me out.

https://www.experts-exchange.com/questions/26873983/Exchange-2003-SMTP-service-causing-high-latency.html