> I work for a large company that is planning to deploy an e-mail system
> that will need to process large amounts of outgoing e-mail (on the
> order of several hundred thousand messages per day). The ability to
> handle varied volumes in parallel with great speed will be of utmost
> importance, since we will be dealing in bulk solicited e-mail
> (i.e. the opt-in variety).

HP was running sendmail and postfix side-by-side for a while on our primary
mail exchangers. Admittedly old numbers and not a highly tuned sendmail
(pretty stock configuration), but generally during the day you would see
the Postfix machine running with a load average of 1-3, and the sendmail
machine running with a load average of 15-25. The postfix machine generally
handled about twice the volume of the sendmail host, and was competing with
a socks server and delegated-DNS server as well. The switch of the remaining
mail gateways to Postfix happened shortly thereafter.

lamont
Not (one of) postmasterhp.com, just one of the folks who pokes them
regularly...

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