In response to the recent RCPT-flooding attacks, I changed my
acl_check_rcpt verification check to say:
deny
domains = +local_domains
!local_parts = postmaster
!verify = recipient
message = Unknown user
delay = 5s
When I test non-existent addresses with a dummy smtp session using
exim -bh
then I see the delay being applied:
>>> check delay = 5s
>>> delay modifier requests 5-second delay
>>> delay skipped in -bh checking mode
However, in the exim log file I'm still seeing 99 denied RCPT commands
all with the same timestamp.
How can this be?
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