IP Packets: How do I test a slow smtp connection

I have a slow IP connection and  would like to test the IP packets between the host and the server.

Is there some open source software or a microsoft utility I can use?
Who is Participating?
Do you mean a speed test between them?  Something like iperf http://sourceforge.net/projects/iperf/
Or examine the packets between the machines - Wireshark (http://www.wireshark.org/)

AdrianSmithUKAuthor Commented:
Perfect. Many thanks.

Adrian Smith
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