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Milter-greylist

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Possible SMTP RCPT flood, throttling and confBAD_RCPT_THROTTLE

2019-06-06 by Marcus Schopen

Hello,

i found by chance a strange phenomenon in my logfile: after three "rcpt 
to" to existing(!) addresses, which are marked with

"milter=greylist, action=rcpt, reject=451 4.7.1 Greylisting in action, 
please come back later"

as they are not yet known by milter-greylist, sendmail will respond with 
"Possible SMTP RCPT flood, throttling" if throtteling is enabled with 
"define(`confBAD_RCPT_THROTTLE',`3')dnl"

Somehow, greylisting seems to be evaluated as "bad recipient" by 
confBAD_RCPT_THROTTLE, which seems to be wrong in this case.

Ciao
Marcus

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