Matthias Andree:
> Well, in a LAN, it might actually be possible to get half a million
> mails through per hour without extensive tuning - however, that's
> without VERP and it assumes your destination machines are *FAST*.

To give you a data point: running smtp-source against smtp-sink
on a 750MHz pentium FreeBSD 4.3 machine without going over a LAN,
with 100 parallel connections:

    tail% /usr/bin/time ./smtp-source -d -m 1000 -s 100 tail:9999
            1.21 real 0.06 user 0.50 sys

That's 1 million messages in 20 minutes.

Same email load, two hosts connected by a 100BaseT ethernet switch,
target is P550 FreeBSD 4.1, with 100 parallel connections:

    tail% /usr/bin/time ./smtp-source -d -m 1000 -s 100 spike:9999
            1.05 real 0.06 user 0.23 sys

The times are pretty much comparable.

Do not expect anything near this performance with a queue on rotating
disk drives, though.

        Wietse
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