An interesting question is "by which metric(s)?"
Among those which I think merit consideration (and I'm sure there
are more) are:
- connection attempts
- message volume
- rejected message volume
- delivered message volume
- unique (or semi-unique) message payloads
- number of clients
- number of sending systems (including zombies)
- number of targeted servers
- number of targeted addresses
- delivery percentage
Of course the problem with many of these is that even estimating them
is difficult, and measuring them may be effectively impossible.
---Rsk
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