Tarpit

Here is a sample SMTP session when you use both Sendmail's
greet pause (30s) and milter-greylist's tarpit (65s).

client -> connect
server (pause 30s by Sendmail)
server -> 220 GREET MESSAGE...
client -> EHLO
server -> 250 ...
client -> MAIL FROM
server -> 250
client -> RCPT TO
server (pause 65s by milter-greylist)
server -> 250
client -> DATA
...
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