----- Original Message -----
From: "Len Conrad" <[EMAIL PROTECTED]>
To: "inFusion Support List" <[EMAIL PROTECTED]>
Sent: Tuesday, September 26, 2000 6:56 AM
Subject: Re: [iMS] Max CPU's or RAM for iMS?
>
> Sending mail is:
>
> 1) how many "SMTP client" processes can be spawned simultaneously
> (memory to hold them) to pick up mail in the send queue.
>
iMS can send up to 1024 mails simultaneously...
> 2) how fast DNS MX and A queries are answered for the remote MTA's
>
iMS has a built-in MX cache...
> 3) how speedy is the SMTP dialog with remote SMTP server
>
I think you would find that there are no other servers that can surpass iMS
in this regard if comparing on equal systems.
>
> A rule of thumb would be one msg delivery per SMTP process every 7
> seconds. So if you could spawn 50 SMTP client processes, each could
> send 9 msgs/minute, giving about 700,000 msgs/day. Probably pretty
> light work for P200 + 128 megs RAM and a unix/postfix machine.
>
Of course, this also depends on the size of the messages, the available
bandwidth, line quality, hops between servers, etc...
We did lab testing on the iMS POST Server and found that iMS Professional
could deliver a theoretical maximum of 7 million messages per day under
ideal conditions assuming that each message was 2k in size. Of course, this
test was internal (LAN bandwidth) and there was no MX lookup except
initially. As a matter of fact, our server here choked out our bandwidth
one day when a 2 Meg attachment was accidentally sent to the iMS support
list - hence, the new throttling feature in version 1.5 :-)
Regards,
Howie
>
> Len
>
>
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