In acl_check_data, I have a bit like this:
warn
condition = ${lookup dnsdb{ptr=$acl_m_data_rip}{false} {true}}
set acl_m_data_noptr = true
with downstream rules looking at acl_m_data_noptr to decide how to
dispose with the message.
acl_m_data_rip is not the connecting host IP, so I can't just use
sender_host_name and related facilities.
The question is how to handle the case when the lookup times
out/DEFERs. From the POV of the downstream rules, this case is
different from either success or failure - I should really like to say
4xx in the SMTP session. But there seems to be no "third way" out of
this context. Or is there?
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