Re: [IMail Forum] anyway to slow MS SMTP

[Matrosity Hosting]

someone else responded with limiting the number of connections to allow and that made sense to me but I'll need to make the time to test it out. Rod Dorman wrote: On Wednesday, December 14, 2005, 19:41:55, Matrosity Hosting wrote: Rod Dorman wrote: On Wednesday, December 14, 2005, 10:43:51, Matrosity Hosting wrote: Is there anything we can do to slow down the amount of bandwidth ms smtp servers hog up when they're sending messages? Send smaller messages? that would probably speed it up. Speed up what? Perhaps I don't understand your use of "bandwidth". I'm treating bandwidth as a measure of quantity of data sent in a unit of time. During the initial negotiation whilst sending the 'envelope' its primarily (ignoring pipelineing) "send a SMTP command", "receive a SMTP response" which due to the turnaround is very latency sensitive. The higher the latency the lower the bandwidth consumption. The 'DATA' phase is essentially shoveling bytes in one direction as fast as you can. Latency has less of an impact as long as the TCP/IP window is big enough and the servers can keep up. Bandwidth consumption is greater than during envelope transmission. So to reduce bandwidth consumption per message you should increase the envelope data to DATA data ratio which would happen if you send smaller messages.