Rafael Azevedo via Postfix-users:
> After fixing that issue, I noticed that when postfix first connect to
> my milter, it starts with 2 requests containing ` * `.
When a Postfix process 'opens' the transport table, it will do one
"*" lookup and remember the result. If the result was not an error,
then **that Postfix process** will not make a "*" query again. If
the result was an error, then **that Postfix process** may do another
"*" lookup after 30s.
Transport lookups with the sender address are needed for sender
addess verification, and also happen as a side effect of
reject_unlisted_sender and smtpd_reject_unlisted_sender (that side
efferct could be optimized away but if this query is killing your
performance, then you have a bigger problem).
Wietse
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