[Standards] s2s and gracelessly broken streams

[Tony Finch]

On Mon, 2 Apr 2007, Chris Mullins wrote:

> If your email relay connects to 5000 IP Addresses per day, you're going
> to hit 65000 IP Addresses in 13 days.

No, because many IP addresses are connected to every day. It actually
takes us about twice as long - 25 days - to reach 65K different IP
addresses. (i.e. there's a long tail of rarely-contacted addresses.)
Anyway, I wasn't trying to argue that there's no point in shutting down
s2s connections, merely that you don't need as many of them as you might
expect. (In particular, it is wrong to add up the sizes of all your users'
rosters or address books to get an estimate, because that will massively
overshoot by not taking into account overlaps.) Therefore it would be a
mistake to shoot down suggestions of fixing the stale presence problem
with occasional probes.

Tony.
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