But the hardware to run the software is not free- and handling really large volumes of email takes *big* hardware.
Think "cluster of 4-way Xeon-2GHz/16Gmem". Or whatever.
I've been pushing ~1.5GB+ (~30K+ messages) inbound and "outbound relay" mail per week through a PII/400 (recently upgraded to 450). It's mostly OK, but if a flood of mail comes in, the load spikes, and in extreme cases it reaches the sendmail QueueLA and RefuseLA points- which I've tuned for that system, *down* from the defaults.
While not free, it's extremely inexpensive. AMD Duron 1.2+ with 256 megs ram. Pushing 97K emails a DAY through qmail/qmail-scanner + clamd/spamc per domain. Total cost? $300 USD. What's that? about 12 cases of beer or 7 good tech books?
Regards,
Rick
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