Here are some sender count statistics...not message counts...within a small
production system. These are the number of senders and their current
states. The number of messages passed/blocked are much greater.
maverix=# select sender_method,count(*) from maverix_senders group by
sender_method;
sender_method | count
---------------+---------
AdminAction | 67
UserBlocked | 31012
BounceBlocked | 434796
SelfVerified | 4254
UserVerified | 8123
1) Sometimes, an Admin has to correct a black or whitelisted sender
2) Users add to their own blacklist.
3) We auto-block a lot of spam by receiving an SMTP error: unknown user
4) Senders do respond to C/R.
5) Users also verify a sender more often than a sender responds to C/R
As I mentioed, the probing is of more value than C/R
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